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

Zinc and mercury do not show variable valency like $d$ -block element because
  1. they are soft.
  2. their $d$ -shells are complete.
  3. they have only two electrons in the outermost shell.
  4. their $d$ -shells are incomplete.

Solution

(b) $\mathrm{Zn}$ and $\mathrm{Hg}$ have $d$ -shells completely filled hence they do not exhibit variable valency.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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