The valency of carbonate radical is similar to

Options

A. chloride
B. phosphate
C. hydride
D. sulphide

Explanation

To determine the valency of the carbonate radical and find which other radical has a similar valency, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Valency**: Valency is the combining capacity of an atom or ion, which indicates how many electrons an atom can gain, lose, or share to form a chemical bond. It can be expressed in terms of charge.

2. **Identify the Carbonate Radical**: The carbonate radical is represented as \( \text{CO}_3^{2-} \). This means it consists of one carbon atom and three oxygen atoms, and it carries a charge of -2.

3. **Determine the Valency of Carbonate**: Since the carbonate radical has a charge of -2, its valency is also 2. This indicates that it can combine with other ions that have a charge of +2 or two ions with a charge of +1.

4. **Find Similar Valencies**: We need to find other radicals or ions that also have a valency of 2.
- The chloride ion (\( \text{Cl}^- \)) has a valency of 1.
- The phosphate ion (\( \text{PO}_4^{3-} \)) has a valency of 3.
- The hydride ion (\( \text{H}^- \)) has a valency of 1.
- The sulfide ion (\( \text{S}^{2-} \)) has a valency of 2.

5. **Conclusion**: The sulfide ion (\( \text{S}^{2-} \)) has the same valency as the carbonate radical, which is 2. Therefore, the answer to the question is that the valency of the carbonate radical is similar to that of the sulfide ion.

### Final Answer:
The valency of the carbonate radical is similar to that of the sulfide ion.