Question

The chemical formula of sulphide of an element ‘X’ having valency 3 is

• A.
  $X{S}_2$
• B.
  $X_{2}S$
• C.
  $X_2{S}_3$
• D.
  $X_2{S}_2$

Answer 1

The correct option is C

$X_2{S}_3$
8. Valency of the element X = 3
Valency of sulphur = 2
On criss-crossing the valencies, we get



Thus, the chemical formula of the compound is $X_2{S}_3.$

Hence, the correct answer is option (c).