Zn cannot displace following ions from their aquous solution:

Options

A. `Al^(+3)`
B. `Cu^(2+)`
C. `Fe^(2+)`
D. `Na^(+)`

Answer

To determine which ions zinc (Zn) cannot displace from their aqueous solutions, we will analyze the standard reduction potentials of zinc and the given ions. The ion with a higher reduction potential than zinc will not be displaced by zinc.

### Step-by-Step Solution:

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

2. **List the Standard Reduction Potentials of Other Ions:**
- For Al³⁺ + 3e⁻ → Al, E° = -1.66 V
- For Cu²⁺ + 2e⁻ → Cu, E° = +0.34 V
- For Fe²⁺ + 2e⁻ → Fe, E° = -0.45 V
- For Na⁺ + e⁻ → Na, E° = -2.71 V

3. **Compare the Reduction Potentials:**
- Compare each ion's reduction potential with that of zinc:
- Al³⁺: -1.66 V (less than -0.76 V)
- Cu²⁺: +0.34 V (greater than -0.76 V)
- Fe²⁺: -0.45 V (greater than -0.76 V)
- Na⁺: -2.71 V (less than -0.76 V)

4. **Determine Which Ions Cannot Be Displaced:**
- Zinc can displace ions with lower reduction potentials. Therefore:
- Zn can displace Al³⁺ and Na⁺.
- Zn cannot displace Cu²⁺ and Fe²⁺ since their reduction potentials are greater than that of zinc.

5. **Conclusion:**
- The ions that zinc cannot displace from their aqueous solutions are Cu²⁺ and Fe²⁺.

### Final Answer:
Zinc cannot displace Cu²⁺ and Fe²⁺ from their aqueous solutions.