Question

an element X has a valency 2. It reacts with another element Y to form a molecule XY. if the valency of element Z, which of the following compounds will it form with element Y? (A) YZ (B) Y²Z (C) YZ² (D) Y²Z³

Answer 1

Explanation:

Valency of X=8−4=4

Valency of Y=8−5=3

Valency of Z=8−7=1

So molecular formulae of these compounds with hydrogen are

(a)XX4

(b)YY3

(c)HZ