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Q.

Zinc and mercury do not show variable valency like d-block elements because

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a

they are soft

b

their d-shells are complete

c

they have only two electrons in the outermost subshell

d

their d-shells are incomplete

answer is B.

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Detailed Solution

30Zn and 80Hg have their d orbitals completely filled so they do not show any variable valency

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