When zinc granule is dipped into copper sulphate solution, copper is precipitated because :

Options

A. Both, copper and zinc have a positive reduction potential.
B. Reduction potential of copper is higher than that of zinc.
C. Reduction potential of zinc is higher than that of copper.
D. Both, zinc and copper have a negative reduction potential.

Explanation

To solve the question, "When zinc granule is dipped into copper sulfate solution, copper is precipitated because:", we need to analyze the electrochemical behavior of zinc and copper.

### Step-by-Step Solution:

1. **Identify the Reaction**:
When zinc (Zn) is placed in a copper sulfate (CuSO₄) solution, a chemical reaction occurs. The zinc displaces copper from the copper sulfate solution.
\[ \text{Zn (s)} + \text{CuSO}_4 \text{(aq)} \rightarrow \text{Cu (s)} + \text{ZnSO}_4 \text{(aq)} \]

2. **Determine Oxidation and Reduction**:
In this reaction, zinc is oxidized (loses electrons) and copper is reduced (gains electrons).
- Zinc goes from Zn (0) to Zn²⁺ (+2), indicating oxidation.
- Copper goes from Cu²⁺ (+2) to Cu (0), indicating reduction.

3. **Standard Reduction Potentials**:
To understand why this reaction occurs, we need to look at the standard reduction potentials of both metals:
- The standard reduction potential for copper (Cu²⁺ + 2e⁻ → Cu) is +0.34 V.
- The standard reduction potential for zinc (Zn²⁺ + 2e⁻ → Zn) is -0.76 V.

4. **Comparing Reduction Potentials**:
Since the reduction potential of copper is higher than that of zinc, copper has a greater tendency to gain electrons (be reduced) compared to zinc. This means that in the presence of zinc, copper ions in the solution will be reduced to solid copper, while zinc will be oxidized to zinc ions.

5. **Conclusion**:
Therefore, the reason copper is precipitated when zinc is dipped into copper sulfate solution is that the reduction potential of copper is higher than that of zinc.

### Final Answer:
Copper is precipitated because the reduction potential of copper is higher than that of zinc.

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