Which of the following metal can replace zinc from `ZnSO_4` solution?

Options

A. Cu
B. Hg
C. Fe
D. A1

Explanation

To determine which metal can replace zinc from a zinc sulfate solution (`ZnSO_4`), we need to analyze the standard reduction potentials of the metals involved. The metal that can replace zinc must have a more negative reduction potential than zinc itself.

### Step-by-Step Solution:

1. **Identify the Reduction Potential of Zinc:**
- The standard reduction potential (E°) for zinc (Zn²⁺ + 2e⁻ → Zn) is given as -0.76 V.

2. **List the Metals and Their Reduction Potentials:**
- We need to compare the reduction potentials of the given metals:
- **Copper (Cu)**: E° = +0.34 V
- **Mercury (Hg)**: E° = +0.85 V
- **Iron (Fe)**: E° = -0.44 V
- **Aluminium (Al)**: E° = -1.66 V

3. **Determine Which Metal Can Replace Zinc:**
- A metal can replace another in a solution if it has a more negative reduction potential (i.e., is a stronger reducing agent).
- Comparing the reduction potentials:
- Copper: +0.34 V (cannot replace zinc)
- Mercury: +0.85 V (cannot replace zinc)
- Iron: -0.44 V (cannot replace zinc)
- Aluminium: -1.66 V (can replace zinc)

4. **Conclusion:**
- Among the given metals, **Aluminium** has a more negative reduction potential than zinc, making it a stronger reducing agent. Therefore, Aluminium can replace zinc from the `ZnSO_4` solution.

### Final Answer:
**Aluminium (Al)** can replace zinc from `ZnSO_4` solution.