MCQ
Zinc does not show variable valency like $d-$ block elements because
- AIt is a soft metal
- ✓$d-$ orbital is complete
- CIt is low melting
- DTwo electrons are present in the outermost orbit
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${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{ - 4}}\xrightarrow{{MnO_4^ - /{H^ + }}}F{e^{ + 3}} + C{O_2} + NO_3^ - $