Electrovalency of non-metal atom is not equal to that of the metal atom in

Options

A. Sodium bromide
B. Magnesium oxide
C. Aluminium nitride
D. Potassium sulphide

Explanation

To solve the question regarding the electrovalency of non-metal atoms not being equal to that of metal atoms, we will analyze different compounds to understand the concept.

### Step-by-Step Solution:

1. **Understanding Electrovalency**:
Electrovalency refers to the charge an atom acquires when it loses or gains electrons to achieve a stable electronic configuration, typically that of the nearest noble gas.

2. **Analyzing Sodium Bromide (NaBr)**:
- Sodium (Na) is a metal and has an oxidation state of +1 (Na⁺).
- Bromine (Br) is a non-metal and has an oxidation state of -1 (Br⁻).
- In NaBr, the electrovalency of Na is 1 and that of Br is also 1. Here, they are equal.

3. **Analyzing Magnesium Oxide (MgO)**:
- Magnesium (Mg) is a metal with an oxidation state of +2 (Mg²⁺).
- Oxygen (O) is a non-metal with an oxidation state of -2 (O²⁻).
- In MgO, the electrovalency of Mg is 2 and that of O is also 2. Again, they are equal.

4. **Analyzing Aluminium Nitrate (Al(NO₃)₃)**:
- Aluminium (Al) is a metal with an oxidation state of +3 (Al³⁺).
- Nitrogen (N) in this case is a non-metal with an oxidation state of -3 (N³⁻).
- In Aluminium Nitrate, the electrovalency of Al is 3 and that of N is also 3. They are equal.

5. **Analyzing Potassium Sulfide (K₂S)**:
- Potassium (K) is a metal with an oxidation state of +1 (K⁺).
- Sulfide (S) is a non-metal with an oxidation state of -2 (S²⁻).
- In Potassium Sulfide, the electrovalency of K is 1 (for each K atom) and that of S is 2. Here, they are not equal.

6. **Conclusion**:
- The electrovalency of non-metal atoms is not equal to that of metal atoms in Potassium Sulfide (K₂S). Therefore, the answer to the question is Potassium Sulfide.

### Final Answer:
The electrovalency of non-metal atom is not equal to that of the metal atom in Potassium Sulfide (K₂S).