Which of the following anions has a valency of -3 ?

Question

Question

This question was previously asked in

NDA-II 2024 (GAT) Official Paper (Held On: 01 Sept, 2024)

Answer 1

CONCEPT:

Valency of Anions

Valency refers to the combining capacity of an element or ion. It is determined by the number of electrons an atom can lose, gain, or share to achieve a full outer shell.
Anions are negatively charged ions formed when atoms gain electrons. The valency of an anion is equal to the number of electrons gained by the atom.

EXPLANATION:

To determine which anion has a valency of -3, we need to look at the common anions and their charges:
- Nitride (N^3-): Nitrogen gains 3 electrons to achieve a full outer shell, resulting in a valency of -3.
- Nitrate (NO₃^-): The nitrate ion has a valency of -1.
- Sulphide (S^2-): Sulfur gains 2 electrons to form the sulphide ion, giving it a valency of -2.
- Sulphate (SO₄^2-): The sulphate ion has a valency of -2.

Therefore, the anion with a valency of -3 is Nitride (N^3-).