Question

If the compound has a molecular formula $X{H}_4$, what is the valency of element X?​

• A. 2
• B. 3
• C. 1
• D. 4

Answer 1

The correct option is D 4

Valency can be defined as the combining capacity of an atom of an element. It is also equal to the number of hydrogen atoms that combine with one atom of it. In $X{H}_4$ molecule, four hydrogen atoms combine with one X atom. Thus, the valency of X is 4.​