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Among the following variable valency is exhibited by

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All the above

answer is D.

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Detailed Solution

Reason: Fe exhibits 3 & 2 valency’s in

FeC l_{3} & FeC l_{2}

‘Au’ exhibits 1 & 3 valencies in

AuC l & AuC l_{3}

and ‘S’ exhibits 2, 4, 6.

Sol: $Fe \to {Fe}^{+ 2} {Fe}^{+ 3}$

$Au \to {Au}^{+}, {Au}^{+ 3}$

$S \to S^{+ 2}, S^{+ 4} S^{+ 6}$

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