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Question

The metal which shows most variable valencies is :

A
iron
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B
aluminium
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C
nickel
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D
cobalt
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Solution

The correct option is A iron
Some elements have more than one valency called as variable valency. In iron (II) sulphate or ferrous sulphate the valency is two but in ferric sulphate the valency of iron is three. So, it shows valency 2 and 3.

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