Common Inorganic Properties

Question 1

Question 1: 1. It is not correct to say that the classification of $2 \mathrm { CaO } \cdot \mathrm { SiO } _ { ...

1. It is not correct to say that the classification of $2 \mathrm { CaO } \cdot \mathrm { SiO } _ { 2 }$ is

A. A. chemical compound
B. B. silicate
C. C. calcium salt
D. D. oxides

Answer

Answer: D

Solution: A. $2 \mathrm { CaO } \cdot \mathrm { SiO } _ { 2 }$ is a pure substance composed of more than two elements and belongs to a compound, so A is correct; B. $2 \mathrm { CaO } \cdot \mathrm { SiO } _ { 2 }$ is a complex silicate, so B is correct; C. $2 \mathrm { CaO } \cdot \mathrm { SiO } _ { 2 }$ belongs to a kind of complex silicate, and the cation is calcium ion, which also belongs to calcium salt, so C is correct; D. Oxides are composed of two elements, one of which is oxygen, so $2 \mathrm { CaO } \cdot \mathrm { SiO } _ { 2 }$ is not an oxide, so D is wrong.

Question 2

Question 2: 2. The following substances are correctly classified | Selection <br> Item | Alkali | Acid | Salt |...

2. The following substances are correctly classified | Selection <br> Item | Alkali | Acid | Salt | Basic oxides | Acid oxides | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | A | KOH | $\mathrm { HNO } _ { 3 }$ | $\mathrm { CaCO } _ { 3 }$ | CaO | $\mathrm { SO } _ { 2 }$ | | B | NaOH | HCl | $\mathrm { NaHSO } _ { 4 }$ | $\mathrm { Na } _ { 2 } \mathrm { O }$ | CO | | C | $\mathrm { Cu } _ { 2 } ( \mathrm { OH } ) _ { 2 } \mathrm { CO } _ { 3 }$ | $\mathrm { CH } _ { 3 } \mathrm { COOH }$ | $\mathrm { CaF } _ { 2 }$ | CuO | $\mathrm { SO } _ { 2 }$ | | D | $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ | $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ | NaOH | $\mathrm { SO } _ { 2 }$ | $\mathrm { CO } _ { 2 }$ |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: A

Solution: $\mathrm { A } . \mathrm { KOH }$ is a base, $\mathrm { HNO } _ { 3 }$ is an acid, $\mathrm { CaCO } _ { 3 }$ is a salt, CaO reacts with water to give calcium hydroxide, which is a basic oxide, and $\mathrm { SO } _ { 2 }$ reacts with water to give sulfurous acid, which is an acidic oxide. A is correct; B. CO cannot react with water to get acid, so it is not an acidic oxide; C. $\mathrm { Cu } _ { 2 } ( \mathrm { OH } ) _ { 2 } \mathrm { CO } _ { 3 }$ is a salt, not a base; D. $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ is a salt, not a base. D. $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ is a salt, not a base.

Question 3

Question 3: 3. Salts that are basic in aqueous solution are

3. Salts that are basic in aqueous solution are

A. A. $\mathrm { NH } _ { 3 }$
B. B. $\mathrm { NaHCO } _ { 3 }$
C. C. $\mathrm { Mg } ( \mathrm { OH } ) _ { 2 }$
D. D. $\mathrm { NH } _ { 4 } \mathrm { Cl }$

Answer

Answer: B

Solution: A. $\mathrm { NH } _ { 3 }$ is a non-metallic hydride that dissolves in water to form ammonia monohydrate, which is basic, but $\mathrm { NH } _ { 3 }$ is not a salt, so A is wrong; B. $\mathrm { NaHCO } _ { 3 }$ is a strong base and weak acid salt which is basic by hydrolysis; C. $\mathrm { Mg } ( \mathrm { OH } ) _ { 2 }$ is a base and is basic; D. $\mathrm { NH } _ { 4 } \mathrm { Cl }$ is a strong acid and weak base salt, which is hydrolyzed to be acidic;

Question 4

Question 4: 4. The following substances must react with each other without salt formation

4. The following substances must react with each other without salt formation

A. A. Acidic and basic oxides
B. B. Acid oxides and alkali solutions
C. C. Acid and base solutions
D. D. Alkaline oxides and water

Answer

Answer: D

Solution: A. Acidic oxides and basic oxides can react to form salts, so A does not fit the question; B.Acidic oxides and bases react to form salt and water, so B does not fit the question; C.Acids and bases react to form salt and water, so C does not fit the question; D. Soluble alkaline oxides can react with water to form bases, and insoluble alkaline oxides cannot react with water, so D meets the meaning of the question;

Question 5

Question 5: 5. Salt is a common class of substances, and the following substances can form salt directly in a si...

5. Salt is a common class of substances, and the following substances can form salt directly in a single step reaction (1) $\_\_\_\_$ metal monomers (2) $\_\_\_\_$ basic oxides (3) $\_\_\_\_$ (4) acids (5) Acidic oxides

A. A. (1) (2) (3)
B. B. (1) (4) (5)
C. C. (2) (3) (5)
D. D. full

Answer

Answer: D

Solution: (1) Metal monomers can react with acids or certain salt solutions to produce salts directly, such as iron reacts with hydrochloric acid to produce a salt of ferrous chloride, so (1) can; (2) Basic oxides can react with acids to produce salts directly, such as sodium oxide reacts with hydrochloric acid to produce sodium chloride directly, so (2) can; (3) Bases can react with acids, acidic oxides, and certain salts to form salts, e.g., sodium hydroxide reacts with carbon dioxide to form sodium carbonate directly, so (3) can; (4) acid can react with alkali, certain salts, alkaline oxides, etc. to form salt, such as hydrochloric acid and sodium hydroxide reaction to produce sodium chloride, so (4) can; (5) acidic oxides can react with bases to form salts, such as carbon dioxide and potassium hydroxide to form potassium carbonate, so (5) can; obviously all can be directly under certain conditions to form salt, so choose: D.

Question 6

Question 6: 7. The following narratives are incorrect

7. The following narratives are incorrect

A. A. Both $\left( \mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O } \right)$ and $\mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 }$ are pure substances.
B. B. $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } \cdot \mathrm { H } _ { 2 } \mathrm { O }$ crystals lose water of crystallization in dry air to $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ powder
C. C. PM2.5 means respirable suspended particulate matter with a particle size not larger than $2.5 \mu \mathrm {~m}$.
D. D. Reactions involving monomers must be redox reactions

Answer

Answer: D

Solution: A. Choleum $\left( \mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O } \right)$ and $\mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 }$ are salts and oxides respectively, which are pure substances, option A is correct; B. Sodium carbonate crystals are easy to sublimate, and sodium carbonate crystals will gradually lose crystallization water to become sodium carbonate powder in dry air, so $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } \cdot \mathrm { H } _ { 2 } \mathrm { O }$ crystals will lose crystallization water to become $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ powder in dry air, option B is correct; B. Sodium carbonate crystals are easy to sublimate. B. Sodium carbonate crystals are easy to sublimate, so $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } \cdot \mathrm { H } _ { 2 } \mathrm { O }$ crystals in dry air will gradually lose their water of crystallization and turn into $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ powder; C. PM2.5 refers to suspended particles with a diameter equal to or less than $2.5 \mu \mathrm {~m}$, which can be suspended in the air for a long time, and the higher the concentration of PM2.5 in the air, the more serious the air pollution, option C is correct; D. Reactions involving monomers are not necessarily redox reactions, such as the interconversion of isomers, option D is wrong; The answer is D.

Question 7

Question 7: 8. The following substances are acidic oxides

8. The following substances are acidic oxides

A. A. CO
B. B. $\mathrm { CO } _ { 2 }$
C. C. NO
D. D. MgO

Answer

Answer: B

Solution: A.CO cannot react with bases and is an unsalted oxide, A is wrong; B.$\mathrm { CO } _ { 2 }$ can react with a base to form salt and water, B is correct; B. $\mathrm { CO } _ { 2 }$ can react with a base to form salt and water; D. MgO can react with acids to form salt and water, so it is a basic oxide; D. MgO can react with acids to form salts and water, and is a basic oxide.

Question 8

Question 8: 9. In "iodized salt", "fluoride toothpaste" and "iron supplements", "iodine, fluoride and iron" refe...

9. In "iodized salt", "fluoride toothpaste" and "iron supplements", "iodine, fluoride and iron" refer to.

A. A. simple substance (consisting purely of one element, such as diamond)
B. B. elemental
C. C. oxides
D. D. materialistic

Answer

Answer: B

Solution: (a) "Iodized salt" generally contains potassium iodate; Fluoride toothpaste usually contains sodium monofluorophosphate and sodium fluoride; "Iron supplements" generally contain ferrous sulfate, in summary, "iodine, fluorine, iron" refers to the elements, so choose B.

Question 9

Question 9: 10. Plant photosynthesis takes up $\mathrm { CO } _ { 2 }$ and releases $\mathrm { O } _ { 2 }$, but...

10. Plant photosynthesis takes up $\mathrm { CO } _ { 2 }$ and releases $\mathrm { O } _ { 2 }$, but as global warming increases the amount of $\mathrm { CO } _ { 2 }$, seabed corals (the main component of which is $\mathrm { CaCO } _ { 3 }$) undergo dissolution to produce [[]]. INLINE_FORMULA_4]], the following statement is false

A. A. Plant photosynthesis: absorbed $\mathrm { CO } _ { 2 }$ is an acidic oxide
B. B. Plant respiration: ${ } ^ { \mathrm { O } _ { 2 } }$ and ${ } ^ { \mathrm { O } _ { 3 } }$ are isoforms of each other
C. C. Seawater absorption $\mathrm { CO } _ { 2 }$ : Seawater changes from a pure substance to a mixture
D. D. Dissolution of corals: The $\mathrm { Ca } \left( \mathrm { HCO } _ { 3 } \right) _ { 2 }$ produced are salts.

Answer

Answer: C

Solution: A. $\mathrm { CO } _ { 2 }$ can react with alkali to form salt and water. $\mathrm { CO } _ { 2 }$ is an acidic oxide; B. ${ } ^ { \mathrm { O } _ { 2 } }$ and $^ { \mathrm { O } _ { 3 } }$ are different monomers composed of the element oxygen and are isomers of each other, so B is correct; C. Seawater contains $\mathrm { NaCl } , \mathrm { MgCl } _ { 2 }$ and other substances, then seawater is a mixture before and after absorbing $\mathrm { CO } _ { 2 }$, so C is wrong; D. $\mathrm { Ca } \left( \mathrm { HCO } _ { 3 } \right) _ { 2 }$ is composed of calcium ions and bicarbonate ions and belongs to salts, so D is correct;

Question 10

Question 10: 11. The following are bases

11. The following are bases

A. A. KOH
B. B. $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$
C. C. $\mathrm { CO } _ { 2 }$
D. D. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$

Answer

Answer: A

Solution: A. KOH can ionize hydroxide and potassium ions and is a base, A correct; B. $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ can ionize sodium ions and carbonate ions, which is a salt, B is wrong; C. $\mathrm { CO } _ { 2 }$ is an oxide; D. $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ can ionize hydrogen ions and sulfate, which is an acid;

Question 11

Question 11: 12. $\mathrm { SO } _ { 2 }$ is an air pollutant. The $\mathrm { SO } _ { 2 }$ in the flue gas of a ...

12. $\mathrm { SO } _ { 2 }$ is an air pollutant. The $\mathrm { SO } _ { 2 }$ in the flue gas of a cement kiln can be removed by wet desulfurization with an efficiency above $95 \%$. The reactions involved are reaction (1) $\mathrm { SO } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O } \rightleftharpoons \mathrm { H } _ { 2 } \mathrm { SO } _ { 3 }$, reaction (2) $$ \mathrm { CaCO } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { SO } _ { 3 } = \mathrm { CaSO } _ { 3 } + \mathrm { CO } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O } \text {, reaction (3) } { } ^ { 2 \mathrm { CaSO } _ { 3 } } + \mathrm { O } _ { 2 } = 2 \mathrm { CaSO } _ { 4 } $$ The following statements are incorrect is

A. A. $\mathrm { CO } _ { 2 } , \mathrm { SO } _ { 2 }$ are acidic oxides
B. B. Reaction (2) is a complex decomposition reaction
C. C. In reaction (3), $\mathrm { CaSO } _ { 3 }$ is the reducing agent
D. D. Reaction (3) per transfer $2 \mathrm {~mol} ^ { \mathrm { e } - }$, consume $11.2 \mathrm {~L} ^ { \mathrm { O } _ { 2 } }$

Answer

Answer: D

Solution: A. Acidic oxides are a class of oxides that can interact with a base to form only a salt and water, $\mathrm { CO } _ { 2 } , \mathrm { SO } _ { 2 }$ are acidic oxides, so A is correct; B. Reaction (2) meets the requirements of the complex decomposition reaction $A B + C D = A D + C B$, which can be regarded as $\mathrm { CaCO } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { SO } _ { 3 } = \mathrm { CaSO } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 }$ after $\mathrm { H } _ { 2 } \mathrm { CO } _ { 3 }$ decomposition, so B is correct; C. In reaction (3), $\mathrm { CaSO } _ { 3 }$ is a reducing agent because of the elevated valence of the S element, so C is correct; D. Reaction (3) each transfer $2 \mathrm {~mol} ^ { \mathrm { e } - }$, consume the standard condition $11.2 \mathrm {~L} ^ { \mathrm { O } _ { 2 } }$, not clear state, so D is wrong;

Question 12

Question 12: 13. The following substances are correctly classified

13. The following substances are correctly classified

A. A. $\mathrm { CO } , \mathrm { CO } _ { 2 } , \mathrm { SO } _ { 2 } , \mathrm { SiO } _ { 2 }$ are acidic oxides, also non-metallic oxides
B. B. Soda ash, caustic soda, and calcium hydroxide are all bases
C. C. Dilute hydrochloric acid and molten sodium chloride conduct electricity, they are both electrolytes
D. D. Dry ice, liquid ammonia, ice-water mixtures, and choleum ( $\mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O }$) are all pure substances and compounds

Answer

Answer: D

Solution: A. $\mathrm { CO } _ { 2 } , \mathrm { SO } _ { 2 } , \mathrm { SiO } _ { 2 }$ can react with NaOH to form only salt and water, which are acidic oxides, but CO can't react with NaOH and is an unsalted oxide, not an acidic oxide; B. Soda ash is sodium carbonate, a salt rather than a base; C. Dilute hydrochloric acid is a mixture, neither electrolyte nor non-electrolyte, C error; D. Dry ice, liquid ammonia, ice-water mixtures, and cholagogue ($\mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O }$) are all composed of one substance, all pure, and are composed of two or more elements, all compounds, D is correct;

Question 13

Question 13: 14. The following compounds are salts ( )

14. The following compounds are salts ( )

A. A. $\mathrm { Na } _ { 2 } \mathrm { O }$
B. B. HCl
C. C. NaOH
D. D. $\mathrm { NaHCO } _ { 3 }$

Answer

Answer: D

Solution: $\mathrm { A } . \mathrm { Na } _ { 2 } \mathrm { O }$ reacts with acids to form salts and water and is a basic oxide; B. HCl dissolved in water ionizes all hydrogen ions, which are acids; B. HCl dissolved in water ionizes all hydrogen ions, which is an acid; D. $\mathrm { NaHCO } _ { 3 }$ consists of sodium ions and bicarbonate ions and is a salt.

Question 14

Question 14: 15. Classification is a commonly used scientific method in the study and research of chemistry, and ...

15. Classification is a commonly used scientific method in the study and research of chemistry, and the following classifications are reasonable ( ).

A. A. Sulfuric acid, limewater, baking soda, and quicklime are in the order of classification of acids, bases, salts, and oxides
B. B. Metal oxides must be basic oxides, non-metal oxides are not necessarily acidic oxides
C. C. Classify chemical reactions as redox or non-redox based on whether or not there is a transfer of electrons in the reaction
D. D. According to whether the dispersion system has the Tyndall effect or not, the dispersion system is classified into solution, colloid and turbid liquid.

Answer

Answer: C

Solution: A. Acids, bases, salts, and oxides are classified as compounds, while limewater is a mixture, not a compound; B. Metal oxides are not necessarily basic oxides, e.g., $\mathrm { Al } _ { 2 } \mathrm { O } _ { 3 }$ is an amphoteric oxide, $\mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$ is an acidic oxide, and non-metallic oxides are not necessarily acidic oxides, e.g., CO, NO are neutral oxides; C. A chemical reaction has a transfer of electrons and no transfer of electrons in two cases, so according to the reaction whether there is a transfer of electrons will be divided into redox reactions and non-redox reactions, C meets the question; D. According to the size of the diameter of the dispersed particles in the dispersion system, the dispersion system is divided into solution, colloid, turbid liquid, D does not fit the question; so the answer is: C.

Question 15

Question 15: 16. The following groups of solutions can be distinguished without the use of other reagents ( )

16. The following groups of solutions can be distinguished without the use of other reagents ( )

A. A. Potassium chloride Sodium hydroxide Sodium nitrate Copper sulphate
B. B. Hydrochloric acid silver nitrate sodium chloride sodium nitrate
C. C. Sodium hydroxide, magnesium sulfate, sodium carbonate, sodium bisulfate
D. D. Barium chloride Sodium sulphate Calcium chloride Calcium nitrate

Answer

Answer: C

Solution: A. From the observation, we can see that the blue solution is copper sulfate, and copper sulfate reaction to produce a precipitate of sodium hydroxide, other substances do not react, then potassium chloride and sodium nitrate can not be distinguished, so A does not meet the question; B. Because hydrochloric acid, sodium chloride and silver nitrate react to produce a white precipitate, other substances do not react with each other, so B does not meet the meaning of the question; C. Because magnesium sulfate can react with sodium hydroxide and sodium carbonate to produce a white precipitate, magnesium sulfate can be identified, sodium bisulfate can dissolve these two precipitates, the gas generated is sodium carbonate, no gas generated is NaOH, so C meets the meaning of the question; D. Sodium sulfate reacts with the other three to produce a precipitate, can identify sodium sulfate, while the other substances do not react with each other, so D does not meet the meaning of the question;

Question 16

Question 16: 17. On December 4, 2024, China's declaration of the "Spring Festival - the social practice of the Ch...

17. On December 4, 2024, China's declaration of the "Spring Festival - the social practice of the Chinese people in celebrating the traditional New Year" was successfully inscribed on the Representative List of the Intangible Cultural Heritage of Humanity of the United Nations Educational, Scientific and Cultural Organization (UNESCO). The following statements about intangible cultural heritage are wrong ( )

A. A. Luoyang Peony Porcelain is a traditional inorganic non-metallic material.
B. B. Iron red used in Suzhou peach woodblock prints is classified as an alkaline oxide
C. C. The brilliant colors of the "iron flower" are only related to the electron leaps outside the nucleus of Fe atoms.
D. D. Spotted copper production process needs to copper mixed with gold, silver and other metals, its melting point is lower than pure copper

Answer

Answer: C

Solution: A. "Luoyang Peony Porcelain" belongs to ceramics, which is a traditional inorganic non-metallic material (silicate), A is correct; B. Iron red is $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$, belonging to the basic oxides (react with acid to produce salt and water), B correct; C. Iron at high temperatures belongs to the "blackbody radiation source", its luminescence not only from the electron jump, but also with the object due to the temperature of the thermal radiation, C error; D. The melting point of the alloy is usually lower than the pure metal, spot copper doped gold, silver melting point than pure copper, D correct; therefore, choose C.

Question 17

Question 17: 18. The following groups of substances, in the order of compounds, monomers, mixtures ( )

18. The following groups of substances, in the order of compounds, monomers, mixtures ( )

A. A. Ice-water mixture, iron, hydrochloric acid
B. B. Air, nitrogen, $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } \cdot 10 \mathrm { H } _ { 2 } \mathrm { O }$
C. C. Edible vinegar, liquid oxygen, iodine
D. D. Soda lime, white phosphorus, slaked lime

Answer

Answer: A

Solution: A. Ice-water mixture is water, which is a compound; iron is a monomer; hydrochloric acid is a mixture; therefore, A meets the meaning of the question; B. Air is a mixture, not a compound; $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } \cdot 10 \mathrm { H } _ { 2 } \mathrm { O }$ is a compound, not a mixture, so B does not meet the meaning of the question; C. Edible vinegar is a mixture, not a compound, so C does not meet the meaning of the question; D. Soda lime is a mixture of sodium hydroxide and calcium oxide, and slaked lime is calcium hydroxide, a compound, so D does not fit the question. D. Soda lime is a mixture of sodium hydroxide and calcium oxide.

Question 18

Question 18: 19. The following statements about oxides are incorrect ()

19. The following statements about oxides are incorrect ()

A. A. Most of the basic oxides cannot combine with water to form bases
B. B. Most nonmetallic oxides are acidic oxides
C. C. Most metal oxides are basic oxides
D. D. CO and $\mathrm { CO } _ { 2 }$ are homozygous.

Answer

Answer: D

Solution: A. Sodium oxide reacts with water to form sodium hydroxide, and iron oxide and magnesium oxide do not react with water, so most of the alkaline oxides cannot combine with water to form bases, so A is correct; B. $\mathrm { CO } _ { 2 } , \mathrm { SO } _ { 2 } , \mathrm { SiO } _ { 2 } , \mathrm { SO } _ { 3 }$ is an acidic oxide, and $\mathrm { CO } , \mathrm { NO }$ is an unsalted oxide, so most nonmetallic oxides are acidic oxides, so B is correct; C. Iron oxide, iron oxide, and magnesium oxide are basic oxides, aluminum oxide is an amphoteric oxide, and $\mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$ is an acidic oxidizing property, so most metal oxides are basic oxides, so C is correct; D. Isomers are different monomers formed by the same element, so CO and $\mathrm { CO } _ { 2 }$ are not isomers, so D is wrong. In summary, the answer is D.

Question 19

Question 19: 20. Arrange the following groups of substances in the correct order for categorizing acids, bases, a...

20. Arrange the following groups of substances in the correct order for categorizing acids, bases, and salts ( )

A. A. Phosphoric acid, slaked lime, caustic soda
B. B. Acetic acid, caustic soda, green alum
C. C. Carbonic acid, quicklime, sodium acetate
D. D. Sulfuric acid, soda ash, gypsum

Answer

Answer: B

Solution: A. Phosphoric acid is an acid, slaked lime (calcium hydroxide) is a base, and caustic soda (sodium hydroxide) is a base; B. Acetic acid is an acid, caustic soda (sodium hydroxide) is a base, and green alum (ferrous sulfate crystals) is a salt, in the correct order, and B meets the question; C. Carbonic acid is an acid, quicklime (calcium oxide) is an oxide, and sodium acetate is a salt; D. Sulfuric acid is an acid, soda ash (sodium carbonate) is a salt, gypsum (calcium sulfate crystals) is a salt, D does not meet the meaning of the question; therefore, choose B.

Question 20

Question 20: 21. The substance in the table below is categorized in exactly the right combination (). | | A | B ...

21. The substance in the table below is categorized in exactly the right combination (). | | A | B | C | D | | :--- | :--- | :--- | :--- | :--- | :--- | | Acids | HCl | $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ | $\mathrm { NaHSO } _ { 4 }$ | $\mathrm { HNO } _ { 3 }$ | | Alkalis | $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ | NaOH | $\mathrm { Fe } ( \mathrm { OH } ) _ { 3 }$ | KOH | | salt | $\mathrm { CuSO } _ { 4 }$ | $\mathrm { BaSO } _ { 4 }$ | NaCl | $\mathrm { NaHCO } _ { 3 }$ | | Oxides | $\mathrm { H } _ { 2 } \mathrm { O }$ | $\mathrm { KClO } _ { 3 }$ | CuO | $\mathrm { Na } _ { 2 } \mathrm { O }$ |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: D

Solution: A. $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ is a salt, not a base, A is wrong; B. $\mathrm { KClO } _ { 3 }$ is a salt, not an oxide; C. $\mathrm { NaHSO } _ { 4 }$ is a salt, not an acid, C is wrong; D. The classification of substances meets the standard, D is correct; Therefore, the reasonable choice is D.

Question 21

Question 21: 22. The following substances are acids

22. The following substances are acids

A. A. $\mathrm { NaHCO } _ { 3 }$
B. B. $\mathrm { HClO } _ { 3 }$
C. C. $\mathrm { NH } _ { 3 }$
D. D. $\mathrm { CH } _ { 4 }$

Answer

Answer: B

Solution: A. Sodium bicarbonate consists of sodium ions and bicarbonate ions and is an acid salt, so A is wrong; B. All the cations produced when chloric acid is ionized are hydrogen ions, which are acids, so B is correct; C. Ammonia in solution can not be ionized is not an acid, so C is wrong; D. Methane is not an acid because it cannot be ionized in solution, so D is wrong; The answer is B.

Question 22

Question 22: 23. The following statements about the classification of substances are correct (1) Dilute soymilk, ...

23. The following statements about the classification of substances are correct (1) Dilute soymilk, silicic acid, and ferric chloride solution are all colloids (2) $\mathrm { HF } , \mathrm { HI }$ are all weak electrolytes (3) $\mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { MgO } , \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 }$ are all basic oxides (4) Alum, glacial acetic acid, and iron tetraoxide are not mixtures (5) neither glucose nor fats are organic polymers

A. A. (4) (5)
B. B. (2) (4)
C. C. (1) (2)
D. D. (3) (5)

Answer

Answer: A

Solution: Test Question Analysis: (1) the dispersant particles of different diameters is the essential difference between the dispersion system, dilute soya bean paste belongs to the colloidal dispersion system, silicate is insoluble precipitate, ferric chloride solution is not a colloid, (1) error; (2) HI belongs to a strong electrolyte, (2) error; (3) $\mathrm { FeO } , \mathrm { MgO }$ reacts with acid to form salt and water, both basic oxides, $\mathrm { Al } _ { 2 } \mathrm { O } _ { 3 }$ can react with both acids and bases, amphoteric oxides, (3) is wrong; (4) alum, glacial acetic acid, iron tetroxide are all pure, (4) is correct; (5) glucose, oils and fats belong to the organic matter. But the relative molecular mass is not large, not polymer compounds, (5) is correct; the answer is A. Exam point: examination of the classification of substances

Question 23

Question 23: 24. The correct classification for each of the items in the following table is () | Category Option...

24. The correct classification for each of the items in the following table is () | Category Options | Isomers | Mixtures | Electrolytes | Nonelectrolytes | | :--- | :--- | :--- | :--- | :--- | :--- | . | A | $\mathrm { O } _ { 2 }$ and $\mathrm { O } _ { 3 }$ | Ice and water mixture | $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ | Ethanol | B | red and white phosphorus | sea water | glacial acetic acid | methane | C | diamonds and white phosphorus | water | water | methane | C | Diamond and Graphite | Aluminum Alloys | $\mathrm { HNO } _ { 2 }$ | $\mathrm { H } _ { 2 }$ | | | | | | | | | | | :--- | :--- | :--- | :--- | :--- | :--- | | D | CaO and $\mathrm { CaO } _ { 2 }$ | Air | Ammonia | Sulphur trioxide |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: B

Solution: A. The ice-water mixture contains only water and is pure, so A is wrong; B.The substances are correctly categorized, so B is correct; C. ${ } ^ { \mathrm { H } _ { 2 } }$ is a monomer, neither an electrolyte nor a non-electrolyte, so C is wrong; D. CaO and $\mathrm { CaO } _ { 2 }$ are not monomers, not isomers, and ammonia is a mixture, neither an electrolyte nor a non-electrolyte, so D is wrong; The answer is B.

Question 24

Question 24: 25. The following is a correct description of oxides

25. The following is a correct description of oxides

A. A. All acid oxides can react with strong base solutions
B. B. All oxides react with water
C. C. Metal oxides are all basic oxides
D. D. An oxide that does not react with an acid must react with a base.

Answer

Answer: A

Solution: A. Acidic oxides are oxides that react with bases to form salts and water, so all acidic oxides can react with strong bases, so A is correct; B. Oxides do not necessarily react with water, such as not salt oxides NO, CO, etc. do not react with water, silicon dioxide does not react with water, so B is wrong; C. Metal oxides can also be acidic, basic or amphoteric oxides, e.g. $\mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$ is an acidic oxide, $\mathrm { Na } _ { 2 } \mathrm { O }$ is a basic oxide, $\mathrm { Al } _ { 2 } \mathrm { O } _ { 3 }$ is an amphoteric oxide, so C is wrong; D. Unsalted oxides such as NO and CO are oxides that do not react with acids and bases, so D is wrong.

Question 25

Question 25: 26. Analogical reasoning is a common way of thinking in chemistry. The following analogies are corre...

26. Analogical reasoning is a common way of thinking in chemistry. The following analogies are correct

A. A. Some metals react with acids to produce gases, then the metal must be the one that reacts with the acid to produce gases
B. B. If an alkaline solution can turn phenolphthalein red, then the solution that can turn phenolphthalein red must be alkaline
C. C. Monomers are substances composed of the same element, then substances composed of the same element must be monomers
D. D. If an acid reacts with a base to form salt and water in a neutralization reaction, the reaction that produces salt and water must be a neutralization reaction

Answer

Answer: B

Solution: A. Metals that do not react with acids to produce gases, e.g., $\mathrm { C } + 2 \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } ($ concentrated $) \stackrel { \text { 三 } } { = } \mathrm { CO } _ { 2 } \uparrow + 2 \mathrm { H } _ { 2 } \mathrm { O } + 2 \mathrm { SO } _ { 2 } \uparrow$. B. Alkaline solutions contain $\mathrm { C } + 2 \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } ($ B. Alkaline solution contains $\mathrm { OH } ^ { - }$, can make phenolphthalein red, alkaline solution can be a solution of alkali, can be a solution of salt, can make phenolphthalein red solution must be alkaline solution, B is correct; C. Substances composed of the same element are not necessarily monomers, e.g., a mixture of $\mathrm { O } _ { 2 }$ and $\mathrm { O } _ { 3 }$ contains only the element O. C is incorrect; D. Reactions that produce salt and water are not necessarily neutralization reactions. Basic oxides react with acids to produce salt and water, such as $\mathrm { O } _ { 2 }$ and $\mathrm { O } _ { 3 }$. The reaction of a basic oxide with an acid also produces salt and water, such as $\mathrm { MgO } + \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } = \mathrm { MgSO } _ { 4 } + \mathrm { H } _ { 2 } \mathrm { O }$, which is not a neutralization reaction;

Question 26

Question 26: 27. Classification can make our learning more efficient. The following substances are correctly clas...

27. Classification can make our learning more efficient. The following substances are correctly classified | Selected <br> Items | Pure substances | Mixtures | Electrolytes | Bases | Salts | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | A | Table salt | Hydrogen peroxide | Sulfuric acid | $\mathrm { Cu } _ { 2 } ( \mathrm { OH } ) _ { 2 } \mathrm { CO } _ { 3 }$ | Bile Alum | B | B | Liquid ammonia | Bleaching powder | $\mathrm { Na } _ { 2 } \mathrm { O }$ | $\mathrm { Ba } ( \mathrm { OH } ) _ { 2 }$ | $\mathrm { NaHSO } _ { 4 }$ | | C | Alum | Chlorine Water | Ammonia | Soda Ash | $\mathrm { NH } _ { 4 } \mathrm { Cl }$ | [INLINE_FORMULA_2]] | D | Crematorium | Ice-water mixtures | Copper | Slipped lime | AgCl |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: B

Solution: A. Table salt is a mixture not a pure substance, A is wrong; B. Liquid ammonia is a pure substance, bleach is a mixture, sodium oxide is an electrolyte, barium hydroxide is a base, and sodium bisulfate is a salt, B is correct; C. ammonia is a mixture not an electrolyte, soda ash is sodium carbonate is a salt not a base, C is wrong; D. Ice-water mixture is a mixture of liquid water and solid ice is a pure substance, copper is a monomer not an electrolyte, D error;

Question 27

Question 27: 28. Tian Gong Kaifu Yi Zuohan Chuan has the following record: "The tide is shallow, and there is no ...

28. Tian Gong Kaifu Yi Zuohan Chuan has the following record: "The tide is shallow, and there is no need to press it with ash. Once the tide passes, the sky will be clear tomorrow. Half a day out of the sun salt cream, quickly tend to sweep up the decoction refining. The following statement is correct

A. A. The substance obtained by "frying" is commonly known as "caustic soda".
B. B. The "salting" process involves a "distillation" operation.
C. C. The "salting" is done in the laboratory using an evaporating dish, an alcohol lamp.
D. D. This documented process involves redox reactions

Answer

Answer: C

Solution: A. The substance obtained by "decoction" is $\mathrm { NaCl } , \mathrm { A }$ wrong; B. "salty" process does not involve "distillation" operation, through evaporation to volatilize the water to get NaCl crystals, B error; C. The experiment involves the evaporation of saline water to obtain NaCl, and the operation will use evaporated blood and alcohol lamps; D. The recorded process involves the extraction of soluble solutes from the solution of the operation, there is no chemical change, there is no redox reaction, D error; Therefore, the answer is: C.

Question 28

Question 28: 29. The following statements are correct (1) A substance containing only one element must be pure (2...

29. The following statements are correct (1) A substance containing only one element must be pure (2) A chemical change occurs when quicklime is used as a desiccant (3) Acidic oxides must be nonmetallic oxides (4) Basic oxides must be metallic oxides (5) Removal of table salt from starch colloids using egg shell membrane and distilled water does not involve chemical change

A. A. (1) (3) (5)
B. B. (2) (3) (4)
C. C. (2) (4) (5)
D. D. (1) (2) (4)

Answer

Answer: C

Solution: (1) Substances containing only one element are not necessarily pure, such as $\mathrm { O } _ { 2 }$ and $\mathrm { O } _ { 3 }$ composed of a mixture of only the element oxygen, wrong; (2) The main component of quicklime is calcium oxide, and when it is used as a desiccant, it utilizes calcium oxide and water to react to form $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$, so a chemical change has occurred, correct; (3) Acidic oxides are not necessarily non-metallic oxides, such as $\mathrm { Mn } _ { 2 } \mathrm { O } _ { 7 }$ can react with alkali to form salt and water, which is an acidic oxide, but it is a metal oxide, wrong; (4) Basic oxides are oxides that react with acids to form salt and water, and any basic oxides that can meet the conditions are metal oxides, (4) is correct; (5) Removing salt from starch colloids with an eggshell membrane and distilled water utilizes the fact that colloids cannot pass through a semipermeable membrane, but molecules and ions can, and does not involve a chemical change, (5) is correct; (2) (4) (5) is correct, so the answer is C.

Question 29

Question 29: 30. The following classification of substances is correct | Options | Bases | Acids | Salts | Basic...

30. The following classification of substances is correct | Options | Bases | Acids | Salts | Basic oxides | Acidic oxides | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | ... | A | $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ | $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ | $\mathrm { NaHCO } _ { 3 }$ | CuO | $\mathrm { SO } _ { 2 }$ | | B | NaOH | HCl | $\mathrm { Na } _ { 2 } \mathrm {~S}$ | $\mathrm { Na } _ { 2 } \mathrm { O }$ | $\mathrm { CO } _ { 2 }$ | $\mathrm { Na } _ { 2 } \mathrm { O }$ | $\mathrm { CO } _ { 2 }$ | C | $\mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH }$ | $\mathrm { CH } _ { 3 } \mathrm { COOH }$ | $\mathrm { NaHSO } _ { 4 }$ | MgO | $\mathrm { SO } _ { 3 }$ | | D | KOH | $\mathrm { HNO } _ { 3 }$ | NaCl | CaO | CO |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: B

Solution: $\mathrm { A } . \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ is a salt and not a base, A is wrong ; B. NaOH is a base, HCl is an acid, $\mathrm { Na } _ { 2 } \mathrm {~S}$ is a salt (consisting of $\mathrm { Na } ^ { + }$ and $\mathrm { S } ^ { 2 - }$), $\mathrm { Na } _ { 2 } \mathrm { O }$ is an alkaline oxide (reacts with an acid to form salt and water), and $\mathrm { CO } _ { 2 }$ is an acidic oxide (reacts with a base to form salt and water). _FORMULA_5]] is an acidic oxide (reacts with a base to form salt and water), B is correct; C. (ethanol) is not a base, C is incorrect; D. CO cannot react with a base to form salt and water and is not an acidic oxide, it is an unsalted oxide, D is incorrect; Answer choice B.

Question 30

Question 30: 31. The following narratives are correct

31. The following narratives are correct

A. A. NaOH solution is ionized into $\mathrm { Na } ^ { + }$ and $\mathrm { OH } ^ { - }$ by an electric current.
B. B. The equation for the ionization of $\mathrm { NaHSO } _ { 4 }$ is $\mathrm { NaHSO } _ { 4 } = \mathrm { Na } ^ { + } + \mathrm { H } ^ { + } + \mathrm { SO } ^ { 2 - }$, therefore $\mathrm { NaHSO } _ { 4 }$ is both an acid and a salt
C. C. Pure sulfuric acid does not conduct electricity, dissolved in water it conducts electricity, but pure sulfuric acid is an electrolyte
D. D. The number of free-moving ions in a solution with strong electrical conductivity must be greater than the number of free-moving ions in a solution with weak electrical conductivity.

Answer

Answer: C

Solution: A.NaOH solution ionizes into $\mathrm { Na } ^ { + }$ and $\mathrm { OH } ^ { - } , \mathrm { A }$ in the presence of water molecules; B. An acid is a compound in which all the cations ionized in aqueous solution are $\mathrm { H } ^ { + }$, so the equation for the ionization of $\mathrm { NaHSO } _ { 4 }$ is $\mathrm { NaHSO } _ { 4 } = \mathrm { Na } ^ { + } + \mathrm { H } ^ { + } + \mathrm { SO } ^ { 4 } \xrightarrow { 2 - }$, so $\mathrm { NaHSO } _ { 4 }$ is an acid salt, B is wrong; C. An electrolyte is a compound that conducts electricity in an aqueous solution or in a molten state, so pure sulfuric acid does not conduct electricity, and dissolved in water conducts electricity, but pure sulfuric acid is an electrolyte, C is correct; D. The conductivity of the solution and the concentration of ions that can move freely in the solution and the charge of the ions, so the number of free-moving ions in a solution with strong conductivity is not necessarily more than the number of free-moving ions in a solution with weak conductivity, D error; Therefore, the answer is: C.

Question 31

Question 31: 32. The following is a correct classification of substances | acids | salts | mixtures | electrolyt...

32. The following is a correct classification of substances | acids | salts | mixtures | electrolytes | | :--- | :--- | :--- | :--- | :--- | :--- | | A | HClO | caustic soda | $\mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O }$ | $\mathrm { CO } _ { 2 }$ | | B | $\mathrm { HNO } _ { 3 }$ | $\mathrm { NaHSO } _ { 4 }$ | Ice-water mixtures | $\mathrm { K } _ { 2 } \mathrm { O }$ | | C | $\mathrm { H } _ { 2 } \mathrm { SiO } _ { 3 }$ | Soda ash | Iodized water | NaCl | | D | NaOH | $\mathrm { BaCO } _ { 3 }$ | cement | $\mathrm { NH } _ { 3 }$ |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: C

Solution: A. Caustic soda is sodium hydroxide, an alkali; $\mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O }$ is a pure substance, $\mathrm { CO } _ { 2 }$ is a non-electrolyte, option A is wrong; B. Ice-water mixture is $\mathrm { H } _ { 2 } \mathrm { O }$, which is a pure substance, option B is wrong; C. $\mathrm { H } _ { 2 } \mathrm { SiO } _ { 3 }$ is a compound in which all the cations ionized are hydrogen ions, and it is an acid; soda ash consists of sodium ions and carbonate ions, and it is a salt; iodized water is a mixture of iodine and water; and NaCl is a compound that conducts electricity in an aqueous solution or in a molten state. NaCl is a compound that can conduct electricity in aqueous solution or in molten state, and is an electrolyte; D. NaOH is a base; $\mathrm { NH } _ { 3 }$ is a nonelectrolyte; The answer is C.

Question 32

Question 32: 33 . The following statements are correct

33 . The following statements are correct

A. A. Because $\mathrm { SO } _ { 2 }$ is bleaching, it can discolor magenta solution, bromine water, acidic $\mathrm { KMnO } _ { 4 }$ solution, and litmus test B. Equal amounts of $\mathrm { SO } _ { 2 }$ and $\mathrm { Cl } _ { 2 }$ are mixed and passed through a collection bottle filled with a wetted colored cloth, the bleaching effect is better.
B. B. Because $\mathrm { SO } _ { 2 }$ is bleaching, it can discolor magenta solution, bromine water, acidic $\mathrm { KMnO } _ { 4 }$ solution, and litmus test B. Equal amounts of $\mathrm { SO } _ { 2 }$ and $\mathrm { Cl } _ { 2 }$ are used to color $\mathrm { Cl } _ { 2 }$.
C. C. $\mathrm { SO } _ { 2 }$, bleach, activated charcoal, and $\mathrm { Na } _ { 2 } \mathrm { O } _ { 2 }$ all discolor red ink and are not based on the same principles
D. D. Both $\mathrm { NO } _ { 2 }$ and $\mathrm { SO } _ { 2 }$ are acidic oxides if they react with water to form acids.

Answer

Answer: C

Solution: A. $\mathrm { SO } _ { 2 }$ discolors bromine water and acidic $\mathrm { KMnO } _ { 4 }$ solution, reflecting the reducing property of sulfur dioxide, and $\mathrm { SO } _ { 2 }$ turns litmus red but doesn't discolor, so A is wrong; B. When equal amounts of $\mathrm { SO } _ { 2 }$ and $\mathrm { Cl } _ { 2 }$ are mixed and passed into a gas cylinder with a moist colored cloth, the reaction $\mathrm { SO } _ { 2 } + \mathrm { Cl } _ { 2 } + 2 \mathrm { H } _ { 2 } \mathrm { O } = \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } + 2 \mathrm { HCl }$ occurs and the product is not bleached, so B is wrong; C. $\mathrm { SO } _ { 2 }$ discolors red ink because sulfur dioxide and pigment are combined; bleach, $\mathrm { Na } _ { 2 } \mathrm { O } _ { 2 }$ discolors red ink because of strong oxidizing property; activated carbon discolors red ink because of adsorptive property, so C is correct; D. $\mathrm { NO } _ { 2 }$ is not an acidic oxide, and $\mathrm { SO } _ { 2 }$ is an acidic oxide, so D is wrong; D. [INLINE_FORMULA_9]] is an acidic oxide, so D is wrong.

Question 33

Question 33: 34. A student fills in the five Olympic rings with five substances, and chemical reactions can occur...

34. A student fills in the five Olympic rings with five substances, and chemical reactions can occur between the substances in the rings. The basic type of reaction that is not involved in the chemical reaction between the substances in the linked rings is ( ) ![](/images/questions/inorganic-properties/image-001.jpg)

A. A. chemical reaction
B. B. decomposition reaction
C. C. displacement reaction (chemistry)
D. D. metathesis (chemistry)

Answer

Answer: B

Solution: A. $\mathrm { CO } _ { 2 }$ combines with C to form $\mathrm { CO } , \mathrm { A }$; B.Decomposition reactions are characterized by one reactant and several products; C.C and $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ are replaced to form $\mathrm { CO } _ { 2 }$ and iron monomers; D. $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ reacts with $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ in a complex decomposition reaction; Therefore, the answer is B.

Question 34

Question 34: 35. The following substances are correctly classified | | acids | bases | salts | acidic oxides | b...

35. The following substances are correctly classified | | acids | bases | salts | acidic oxides | basic oxides | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | ... | A | $\mathrm { H } _ { 2 } \mathrm { SO } _ { 4 }$ | NaOH | $\mathrm { CaCO } _ { 3 }$ | $\mathrm { H } _ { 2 } \mathrm { O }$ | CaO | | B | HCl | $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ | $\mathrm { NH } _ { 4 } \mathrm { Cl }$ | CO | MgO | | C | HClO | KOH | $\mathrm { KNO } _ { 3 }$ | $\mathrm { SO } _ { 3 }$ | $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ | $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ | $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ | D | $\mathrm { HNO } _ { 3 }$ | $\mathrm { NH } _ { 3 }$ | $\mathrm { MgCl } _ { 2 }$ | $\mathrm { CO } _ { 2 }$ | CuO |

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: C

Solution: A. $\mathrm { H } _ { 2 } \mathrm { O }$ does not react with acids and bases, and is an unsalted oxide, so A is wrong; B.CO does not react with acids or bases and is an unsalted oxide, so B is wrong; C. The cations ionized by HClO are all $\mathrm { H } ^ { + }$, so HClO is an acid, the anions ionized by KOH are all $\mathrm { OH } ^ { - }$, so KOH is a base, and $\mathrm { KNO } _ { 3 }$ consists of a metal cation and an acid anion, so it's a salt, and $\mathrm { H } _ { 2 } \mathrm { O }$ is a salt. INLINE_FORMULA_4]] reacts with a base to form a salt and water, then it is an acidic oxide, and $\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 }$ reacts with an acid to form a salt and water, then it is a basic oxide, so C is correct; D. $\mathrm { NH } _ { 3 }$ is a hydride, not a base, so D is wrong;

Question 35

Question 35: 36. The classification of some Al-containing or C-containing substances and the corresponding valenc...

36. The classification of some Al-containing or C-containing substances and the corresponding valency relationships are shown in the figure, and the following statements are not correct. ![](/images/questions/inorganic-properties/image-002.jpg)

A. A. a must be able to react with both acids and bases
B. B. An excess of e into the d solution produces c and ${ } ^ { g }$
C. C. Acid: f $> \mathrm { c }$
D. D. Electrolysis of $b$ in the molten state can yield $a$

Answer

Answer: A

Solution: A. a is Al or $\mathrm { C } , \mathrm { C }$ cannot react with bases; B. $\mathrm { Na } \left[ \mathrm { Al } ( \mathrm { OH } ) _ { 4 } \right] _ { \text {溶液中通入过量的 } } \mathrm { CO } _ { 2 }$ can be used to form $\mathrm { Al } ( \mathrm { OH } ) _ { 3 }$ and $\mathrm { NaHCO } _ { 3 }$, option B is correct; C. According to $\mathrm { H } _ { 2 } \mathrm { CO } _ { 3 }$ to make $\mathrm { Al } ( \mathrm { OH } ) _ { 3 }$, we can know the acidity: $\mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } > \mathrm { Al } ( \mathrm { OH } ) _ { 3 }$, option C is correct; D. Electrolysis of $\mathrm { Al } _ { 2 } \mathrm { O } _ { 3 }$ in its molten state gives Al, Option D is correct Answer choice A.

Question 36

Question 36: 37. Chemistry is closely related to production and life. The following statements are not correct ( ...

37. Chemistry is closely related to production and life. The following statements are not correct ( )

A. A. The colorful fireworks that are set off during festivals show the flame colors of different metallic elements
B. B. Food bags are filled with quicklime, which is an alkaline oxide
C. C. Iron oxide is a reddish brown powder, often used as a red pigment in paints and coatings.
D. D. Sodium bicarbonate can be used in textile, paper and soap making industries.

Answer

Answer: D

Solution: A. The flame color of different metal elements is different, colorful fireworks show the flame color of different metal elements, A is correct; B. quicklime has a strong water absorption, can absorb water vapor in the surrounding environment, so that the surrounding environment to keep dry, so often in the bag into the quicklime, to prevent the food moisture and deterioration, which belongs to the alkaline oxides, B correct; C. The red pigment of paint or coating contains iron oxide, iron oxide is a reddish brown powder, C is correct; D. Sodium carbonate aqueous solution is alkaline, can be used in textiles, paper, soap and other industries, sodium bicarbonate alkaline weak, do not use sodium bicarbonate, D error;

Question 37

Question 37: 38. The following descriptions of the classes and properties of the substances are incorrect ( ). |...

A. A. A
B. B. B
C. C. C
D. D. D

Answer

Answer: C

Solution: A. Barium sulphate is an oxygenate salt of an active metal, an ionic compound, and can conduct electricity by ionizing ions in its molten state; B. Sodium bicarbonate is an acid salt, but the degree of hydrolysis of bicarbonate ions is greater than the degree of ionization, and the solution is alkaline. B is correct; C. Liquid ammonia has a single component and is a pure substance, but it cannot ionize free-moving ions and cannot conduct electricity; D. Sucrose belongs to organic matter, can not ionize their own free-moving ions, the aqueous solution does not conduct electricity, D is correct; The answer is C.

Question 38

Question 38: 39. Copper long placed in the air and the air will produce water vapor, carbon dioxide, oxygen, "gre...

39. Copper long placed in the air and the air will produce water vapor, carbon dioxide, oxygen, "green patina", the "green patina" commonly known as "copper green" also known as Malachite" [$\mathrm { Cu } _ { 2 } ( \mathrm { OH } ) _ { 2 } \mathrm { CO } _ { 2 }$]] "Copper green" can react with acid to produce copper salts, carbon dioxide and water. A student realizes "Copper $\rightarrow$ Copper green $\rightarrow$ ---- - $\rightarrow$ copper". Copper $- \xrightarrow { ( 1 ) }$ Copper Green $- \xrightarrow { ( 2 ) }$ A $- \xrightarrow { ( 3 ) } \mathrm { Cu } ( \mathrm { OH } ) _ { 2 } - \xrightarrow { ( 4 ) } \mathrm { Z } - \xrightarrow [ \mathrm { H } _ { 2 } ] { ( 5 ) } \mathrm { Cu }$ ## The following statements are incorrect ( )

A. A. Copper green is an alkali salt
B. B. B is copper oxide
C. C. (4) for decomposition and redox reactions
D. D. (5) for replacement and redox reactions

Answer

Answer: C

Solution: A. Copper green is $\mathrm { Cu } _ { 2 } ( \mathrm { OH } ) _ { 2 } \mathrm { CO } _ { 2 }$ and belongs to alkali salt, so A is correct; B. Copper hydroxide heated decomposition of copper oxide, copper oxide is reduced to copper with hydrogen, B is copper oxide, so B is correct; C. (4) for the decomposition of copper hydroxide to generate copper oxide and water, the elemental valence remains unchanged, not a redox reaction, so C is wrong; D. (5) for the reaction of copper oxide and hydrogen to generate copper and water, belonging to the replacement reaction, copper, hydrogen, elemental valence change, belonging to the redox reaction, so D is correct; C.

Question 39

Question 39: 40. The following statements are correct ( ) (1) A substance that contains only one element must be ...

40. The following statements are correct ( ) (1) A substance that contains only one element must be pure (2) Lime as a desiccant involves a chemical change. (3) All acidic oxides can react with water to form acids. (4) basic oxides must be metal oxides (5) Removing table salt from starch colloids with egg shell membranes and distilled water does not involve a chemical change. High School Chemistry Assignment, October 31, 2025

A. A. (1) (3)
B. B. (1) (2) (3) (4) (5)
C. C. (2) (4)
D. D. (2) (4) (5)

Answer

Answer: D

Solution: (1) A substance containing only one element is not necessarily pure, e.g., a mixture of $\mathrm { O } _ { 2 } , \mathrm { O } _ { 3 }$ contains only the element O, so (1) is incorrect; (2) When quicklime is used as a desiccant, the reaction $\mathrm { CaO } + \mathrm { H } _ { 2 } \mathrm { O } = \mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$ occurs, which involves a chemical change, so (2) is correct; (3) Acidic oxides do not necessarily react with water to form acids, e.g., $\mathrm { SiO } _ { 2 }$ and water do not react, so (3) is incorrect; (4) Basic oxides must be metal oxides, so (4) is correct; (5) The use of eggshell membranes and distilled water to remove salt from starch colloids belongs to dialysis, which does not involve chemical changes, so (5) is correct; the correct (2) (4) (5), choose D .

Common Inorganic Properties

Topic Overview

Key Points

Study Tips

Practicing topics ≠ Passing the exam

Related Learning Resources