Which of the following element shows variable valency?

Copper

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Sodium

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Calcium

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Magnesium

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Solution

The correct option is C Copper
Copper shows variable valency as it is a d block element.

Thus, copper forms compounds containing $C u^{+}$ ions or $C u^{+ +}$ ions. Representative elements sodium, calcium and magnesium shows $+ 1$ , $+ 2$ and $+ 2$ oxidation states respectively.

Hence, correct option is $A$ .

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