Question

All elements have only one valency.

• A. True
• B. False

Answer 1

The correct option is B False

Definition of valency.

Valency is defined as the combining capacity of an element.

Some elements have more than one valency. They are said to have variable valencies.

Example: Iron exhibits valency 2 when it combines with oxygen to form ferrous oxide($\mathrm{FeO}$) and it exhibits the valency 3 when it combine with oxygen to form ferric oxide (${\mathrm{Fe}}_2{\mathrm{O}}_3$).

Therefore the given statement is false.