Assertion (A): Zinc-copper couple that can be used as a reducing agent
Reason (R): Zinc copper couple can be obtained from zinc coated from copper

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true and R is not the correct explanation of A
C. A is true but Ris false
D. A is false but R is true

Answer

### Step-by-Step Text Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that the zinc-copper couple can be used as a reducing agent.
- A reducing agent is a substance that donates electrons to another substance, reducing it while itself gets oxidized.

2. **Analyzing the Zinc-Copper Couple**:
- Zinc (Zn) is more reactive than copper (Cu) and can easily lose electrons (get oxidized).
- When zinc is used in a reaction with copper ions (Cu²⁺), zinc will oxidize and reduce the copper ions to copper metal.

3. **Understanding the Reason (R)**:
- The reason provided states that the zinc-copper couple can be obtained from zinc coated with copper.
- This implies that zinc can be coated with copper ions through a displacement reaction, where zinc displaces copper from its salt solution.

4. **Examining the Reaction**:
- When zinc is dipped in a copper(II) sulfate solution (CuSO₄), the reaction occurs as follows:
\[ \text{Zn (s)} + \text{Cu}^{2+} \text{(aq)} \rightarrow \text{Zn}^{2+} \text{(aq)} + \text{Cu (s)} \]
- Here, zinc displaces copper from the solution, resulting in the deposition of copper on the surface of zinc.

5. **Conclusion**:
- Both the assertion and the reason are correct. However, the reason does not correctly explain why the zinc-copper couple acts as a reducing agent.
- The assertion is true because zinc can act as a reducing agent, but the reason is not a valid explanation for this assertion.

### Final Answer:
- Assertion (A) is correct: Zinc-copper couple can be used as a reducing agent.
- Reason (R) is correct: Zinc-copper couple can be obtained from zinc coated with copper.
- However, Reason (R) is not the correct explanation for Assertion (A).

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