Chemical Bonding

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1. CSCA Chemistry December 2025 Past Paper
   Which group of substances contains the same type of chemical bond(s) throughout? ( )
   • A. NaCl and HCl
   • B. O₂ and H₂
   • C. HNO₃ and NH₄NO₃
   • D. NaOH and KCl
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   Jawaban: B

   Answer: B O₂ and H₂ are both nonmetal molecules held together only by covalent bonds. NaCl is ionic while HCl is covalent; HNO₃ is covalent while NH₄NO₃ has ionic and covalent bonds; NaOH has ionic and covalent bonds while KCl is only ionic.
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2. CSCA Chemistry April 2026 Past Paper
   Among the following substances, the one that contains ionic bonds is ( ).
   • A. NaCl
   • B. CO
   • C. $\mathrm{N_{2}}$
   • D. $\mathrm{H_{2}O}$
   Lihat jawaban & pembahasan

   Jawaban: A

   Answer: A NaCl is composed of $\mathrm{Na^{+}}$ and $\mathrm{Cl^{-}}$ and contains ionic bonds.
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3. CSCA Chemistry March 2026 Past Paper
   In which pair are the bond types not entirely the same?
   • A．MgO and $\mathrm { CaCl } _ { 2 }$
   • B．$\mathrm { H } _ { 2 } \mathrm { O }$ and $\mathrm { CO } _ { 2 }$
   • C．$\mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 }$ and KCl
   • D．$\mathrm { NH } _ { 4 } \mathrm { Cl }$ and NaCl
   Lihat jawaban & pembahasan

   Jawaban: D

   $\mathrm { NH } _ { 4 } \mathrm { Cl }$ : ionic + covalent bonds. NaCl: ionic only. Different types. Answer: D.
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