Question

H
4. Name two elements that have variable valency. Give the formulae and names of two compounds
formed by each of these elements​

Answer 1

For example, copper, tin, iron and mercury exhibit variable valency. Copper combines with oxygen to form cuprous oxide (Cu2O) and cupric oxide (CuO). Valency of oxygen being two, combining capacity of copper in the first case is one and that in the second case is two.

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