Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Electro Chemistry

Question:

Which of the following statements are correct with reference to the following reaction?
$ \text{Zn}(s)+\text{Cu}^{2+}(aq)\rightarrow\text{Zn}^{2+}(aq)+\text{Cu}(s) $

(A) The reduction reaction is $ \text{Cu}^{2+}(aq)+2e^{-}\rightarrow\text{Cu}(s) $
(B) The oxidation reaction is $ \text{Zn}(s)\rightarrow\text{Zn}^{2+}(aq)+2e^{-} $
(C) The two half (oxidation and reduction) reactions constitute redox couple.
(D) The given reaction is not a redox reaction.

Choose the correct answer from the options given below:

Options:

(A), (B) and (C) only

(A), (B) and (D) only

(A), (B), (C) and (D)

(B), (C) and (D) only

Correct Answer:

(A), (B) and (C) only

Explanation:

The correct answer is Option (1) → (A), (B) and (C) only

$ \text{Cu}^{2+}+2e^{-}\rightarrow\text{Cu}(s) $ is the reduction half-reaction ($ \text{Cu}^{2+}$ gains electrons).

$ \text{Zn}(s)\rightarrow\text{Zn}^{2+}+2e^{-} $ is the oxidation half-reaction ($Zn$ loses electrons).

These half-reactions represent the redox couples $\text{Cu}^{2+}/Cu$ and $\text{Zn}^{2+}/Zn$, so together they form the redox process.

False — the overall reaction is a classic redox reaction.