_________ shows variable valency.

Sodium

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Copper

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Magnesium

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Chlorine

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Solution

The correct option is B Copper
Copper exhibits a valency of 1 as well as 2, whereas sodium, magnesium and chlorine show only a single valency, i.e., 1, 2 and 1 respectively. Hence, copper shows variable valency.

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Similar questions

(a) Explain the terms 'valency' and 'variable valency'.

(b) How are the elements with variable valency named ? Explain with an example.

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

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