Physical Chemistry - Redox Reactions
Q. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, what is being oxidized? (2021)
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A.
Fe²⁺
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B.
Cl2
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C.
Fe³⁺
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D.
Cl⁻
Solution
In this reaction, Fe²⁺ is being oxidized to Fe³⁺ as it loses electrons.
Correct Answer: A — Fe²⁺
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Q. In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which element is oxidized? (2022)
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A.
Zn
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B.
Cu²⁺
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C.
Zn²⁺
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D.
Cu
Solution
Zinc (Zn) is oxidized as it loses electrons to form Zn²⁺.
Correct Answer: A — Zn
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Q. What is the oxidation state of nitrogen in NH4Cl? (2023)
Solution
In NH4Cl, the oxidation state of nitrogen is -3, as it is bonded to four hydrogens.
Correct Answer: A — -3
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Q. What is the role of MnO4⁻ in acidic medium during redox reactions? (2020)
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A.
Oxidizing agent
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B.
Reducing agent
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C.
Neutral agent
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D.
Catalyst
Solution
MnO4⁻ acts as an oxidizing agent in acidic medium, as it gains electrons and is reduced.
Correct Answer: A — Oxidizing agent
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Q. Which of the following reactions is an example of a redox reaction? (2023)
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A.
H2 + Cl2 → 2HCl
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B.
NaOH + HCl → NaCl + H2O
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C.
CaCO3 → CaO + CO2
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D.
C + O2 → CO2
Solution
The reaction C + O2 → CO2 is a redox reaction because carbon is oxidized and oxygen is reduced.
Correct Answer: D — C + O2 → CO2
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