Redox Reactions

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1. CSCA Chemistry December 2025 Past Paper
   Which of the following is commonly used as an oxidizing agent? ( )
   • A. Iron
   • B. Carbon monoxide
   • C. Potassium permanganate
   • D. Hydrogen gas
   정답 및 풀이 보기

   정답: C

   Answer: C In KMnO₄, Mn is in the +7 oxidation state and is very easily reduced, so potassium permanganate is a common strong oxidizing agent. Iron, carbon monoxide and hydrogen are reducing agents.
   CSCA Chemistry December 2025 Past Paper 전체에서 보기
2. CSCA Chemistry April 2026 Past Paper
   Among the following reactions, the one that is a double displacement (metathesis) reaction is ( ).
   • A. Hydrogen burning in oxygen
   • B. Thermal decomposition of sodium bicarbonate
   • C. Zinc reacting with dilute sulfuric acid
   • D. Hydrochloric acid reacting with sodium hydroxide
   정답 및 풀이 보기

   정답: D

   Answer: D Hydrochloric acid reacting with sodium hydroxide is a neutralization, i.e., a double displacement reaction.
   CSCA Chemistry April 2026 Past Paper 전체 풀기 — 시간 측정 및 채점
3. CSCA Chemistry March 2026 Past Paper
   Which reaction is not a basic type but is a redox reaction?
   • A．$2 \mathrm { Na } + 2 \mathrm { H } _ { 2 } \mathrm { O } = 2 \mathrm { NaOH } + \mathrm { H } _ { 2 } \uparrow$
   • B．$\mathrm { CO } + \mathrm { CuO } \rightarrow \mathrm { Cu } + \mathrm { CO } _ { 2 }$
   • C．$\mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } + 6 \mathrm { HCl } = 2 \mathrm { FeCl } _ { 3 } + 3 \mathrm { H } _ { 2 } \mathrm { O }$
   • D．$2 \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } \rightarrow 2 \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { O } _ { 2 } \uparrow$
   정답 및 풀이 보기

   정답: B

   $\mathrm { CO } + \mathrm { CuO } \rightarrow \mathrm { Cu } + \mathrm { CO } _ { 2 }$ : two compounds react (not basic type); $\mathrm { C } ( + 2 \rightarrow + 4 )$ oxidized, $\mathrm { Cu } ( + 2 \rightarrow 0 )$ reduced = redox. Answer: B.
   CSCA Chemistry March 2026 Past Paper 전체 풀기 — 시간 측정 및 채점