What is variable valency ? Name two elements having variable valency and state their valencies.

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Solution

Variable valency: Some elements exhibit more than one valency. They are said to have variable
valency, e.g. Iron, copper, tin, lead.
Iron Fe $F e^{2 +}$ or $F e^{3 +}$
Copper cu $C u^{+}$ or $C u^{2 +}$

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