Question

6. What is variable valency ? Give two examples
of elements showing variable valency.​

Answer 1

Answer:

Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. This is termed variable valency.

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Answer 2

Certain elements exhibit more than one valency known as variable example.

Examples-

Fe2+ and Fe3+ I.e.iron exhibit two valency one +2 and the other +3 by losing 2 and 3 electrons respectively.

Hg+ and Hg2+ I.e. mercury exhibit two valency one +1 and the other +2 by losing 1 and 2 electrons respectively.