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Q.

Variable valency is shown by

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a

Copper

b

Sulphur

c

Aluminium

d

Iron

answer is A, B, D.

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Detailed Solution

Generally transition elements show variable valence except IIB group elements. Ex: Cu, Fe . Cu (I) , Cu(II) and Fe (II) , Fe (III) in their compounds. Non- metal element Sulphur , S exhibits variable valency 2, 4, 6. Al show only −3 oxidation state.

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Variable valency is shown by