The valency of sulphate radical is equal to the valency of

Options

A. phosphate radical
B. hydrogen phosphate radical
C. dihydrogen phosphate radical
D. phosphide radical

Explanation

To determine the valency of the sulfate radical and find which radical it is equal to, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the sulfate radical**: The sulfate radical is represented as \( \text{SO}_4^{2-} \). This indicates that it has a charge of -2.

2. **Understand valency**: Valency refers to the combining capacity of an element or radical, which can be determined by the charge it carries. In this case, the valency of the sulfate radical is -2.

3. **Compare with other radicals**: We need to find other radicals that have the same valency of -2. Some common radicals to consider are:
- Phosphate radical: \( \text{PO}_4^{3-} \) (valency -3)
- Hydrogen phosphate radical: \( \text{HPO}_4^{2-} \) (valency -2)
- Dihydrogen phosphate radical: \( \text{H}_2\text{PO}_4^{-} \) (valency -1)
- Phosphide radical: \( \text{P}^{3-} \) (valency -3)

4. **Identify the matching radical**: Among the radicals listed, the hydrogen phosphate radical \( \text{HPO}_4^{2-} \) has the same valency of -2 as the sulfate radical.

5. **Conclusion**: Therefore, the valency of the sulfate radical is equal to the valency of the hydrogen phosphate radical.

### Final Answer:
The valency of the sulfate radical is equal to the valency of the hydrogen phosphate radical.