Question

What is variable valency? Give two examples.

Answer 1

Answer:

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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

Example :- copper, tin, iron and mercury

Answer 2

Answer:

some elements have two valances elements which have to valencies are known to have variable valency

Explanation:

example FE²+,³+

Cu¹+,²+