Which among the following salts produces maximum number of metal ions per molecule when dissolved in a suitable solvent?

Options

A. aluminium phosphate, `AlPO_4`
B. magnesium phosphate, `Mg_3(PO_4)_2`
C. sodium biphosphate, `Na_2HPO_4`
D. aluminium dihydrogen phosphate, `Al(H_2PO_4)`

Explanation

To determine which salt produces the maximum number of metal ions per molecule when dissolved in a suitable solvent, we will analyze the dissociation of each salt in water.

### Step-by-Step Solution:

1. **Identify the Salts**: The salts to be analyzed are:
- Aluminium Phosphate (AlPO4)
- Magnesium Phosphate (Mg3(PO4)2)
- Sodium Biphosphate (Na2HPO4)
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