Number of water molecules acting as ligands in
`CuSO_(4).5H_(2)O,ZnSO_(4).5H_(2)O,FeSO_(4).7H_(2)O` respectively are .

Options

A. `5,5,7`
B. `4,5,4`
C. `4,4,6`
D. `4,4,7`

Explanation

To determine the number of water molecules acting as ligands in the coordination compounds CuSO₄·5H₂O, ZnSO₄·5H₂O, and FeSO₄·7H₂O, we will analyze the coordination numbers of the respective metal ions and how many water molecules can coordinate with them.

### Step-by-Step Solution:

1. **Identify the Metal Ions and Their Oxidation States:**
- In CuSO₄·5H₂O, the copper ion (Cu²⁺) has an oxidation state of +2.
- In ZnSO₄·5H₂O, the zinc ion (Zn²⁺) has an oxidation state of +2.
- In FeSO₄·7H₂O, the iron ion (Fe²⁺) has an oxidation state of +2.

2. **Determine the Coordination Numbers:**
- For Cu²⁺, the coordination number is typically 4.
- For Zn²⁺, the coordination number is also 4.
- For Fe²⁺, the coordination number can be 4 or 6. However, in the hydrated form (FeSO₄·7H₂O), it typically coordinates with 6 water molecules.

3. **Calculate the Number of Water Molecules Acting as Ligands:**
- In CuSO₄·5H₂O:
- The coordination number is 4, so 4 water molecules act as ligands.
- In ZnSO₄·5H₂O:
- The coordination number is also 4, so 4 water molecules act as ligands.
- In FeSO₄·7H₂O:
- The coordination number can be 6, so 6 water molecules act as ligands.

4. **Summarize the Findings:**
- CuSO₄·5H₂O: 4 water molecules
- ZnSO₄·5H₂O: 4 water molecules
- FeSO₄·7H₂O: 6 water molecules

### Final Answer:
The number of water molecules acting as ligands in CuSO₄·5H₂O, ZnSO₄·5H₂O, and FeSO₄·7H₂O are 4, 4, and 6 respectively.