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Q.

Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because:

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a

sulphur is bigger atom than oxygen

b

of the presence of d-orbitals in sulphur

c

sulphur is less electronegative than oxygen

d

ionisation potential of sulphur is more than oxygen

answer is D.

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Detailed Solution

In sulphur, the excitation of np-electrons to nd-subshell gives rise to increase in number of unpaired electrons.

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Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because: