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
   정답 및 풀이 보기

   정답: 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.
   CSCA Chemistry December 2025 Past Paper 전체에서 보기
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. $\mathrm{H_{2}O}$
   정답 및 풀이 보기

   정답: A

   Answer: A NaCl is composed of $\mathrm{Na^{+}}$ and $\mathrm{Cl^{-}}$ and contains ionic bonds.
   CSCA Chemistry April 2026 Past Paper 전체 풀기 — 시간 측정 및 채점
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
   정답 및 풀이 보기

   정답: D

   $\mathrm { NH } _ { 4 } \mathrm { Cl }$ : ionic + covalent bonds. NaCl: ionic only. Different types. Answer: D.
   CSCA Chemistry March 2026 Past Paper 전체 풀기 — 시간 측정 및 채점