Variable valency is exhibited by _____.

Question

Question

This question was previously asked in

RRC Group D Previous Paper 30 (Held On: 28 Sept 2018 Shift 2)

Answer 1

The correct answer is Option 2, i.e Transition Elements.

Important Points

There are elements which differ in the capacity to combine with other elements.
This depends on the nature of the reaction.
The property of such kind of elements is called variable valency.
For example, the iron in ferrous oxide exhibits a valency of +2, whereas in ferric oxide, it has a valency of +3.
The transition elements are those elements having a partially filled d or f subshell in any common oxidation state.
The term "transition elements" most commonly refers to the d-block transition elements.
Variable valency is thus exhibited by the Transition elements due to partially filled subshells.