Question

Element $X$ is a metal with a valency 2. Element $Y$ is a non-metal with a valency 3.

If Y is a diatomic gas, the balance equations for the direct combination of X and Y to form a compound is :

• A. $X^{2+}+2Y^{3-}\to X_3{Y}_2$
• B. $3X^{+}+2Y^{3-}\to X_3{Y}_2$
• C. $2X^{2+}+2Y^{2-}\to X_2{Y}_2$
• D. $3X^{2+}+2Y^{3-}\to X_3{Y}_2$

Answer 1

The correct option is D $3X^{2+}+2Y^{3-}\to X_3{Y}_2$

Explanation:

$X$ element is a metal so its tend to lose the valency electron which are $2$ electrons

$Y$ is a non-metal so its tend to gain or share the valency electrons which are $3$

So

$Y+3e^{-}\to Y^{-3}$ gain electrons

$Y+Y\to Y_2$ each atom share $3$ electrons

When $X$ combined with $Y$

$3X+Y_2\to X_3{Y}_2$

example:$3Mg+N_2\to M{g}_3{N}_2$

Option D is correct