Question

Ions of element X forms a nitride with the chemical formula $X_3{N}_2$.

What is the valency of X?

• A. 5
• B. 1
• C. 3
• D. 2

Answer 1

The correct option is D 2

The formula of a compound is obtained by criss-crossing the valencies of its ions.
$X_3{N}_2$ contains ions of 'X' and $N^{3-}$.

Let the valency of 'X' be 'a'.

Symbol	X	N
Valency	a	3

The formula comes to be as $X_3{N}_a$.
Upon comparing $X_3{N}_2$ with $X_3{N}_a$, we get the value of a = 2.
Therefore, the valency of 'X' is 2.