Question
Give reasons : Zinc salts are colourless.
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Answer
- Colour of the ions of $d-$block elements depends on the number of unpaired electrons in $(n – 1) d-$orbitals.
- Zinc forms salts of $Zn^{2+} $ ions.
- The electronic configuration of $Zn ^{+2}$ is $[ Ar ] 3 d ^{10}$.
- Since $Zn^{+2} $does not have unpaired electrons in $3d-$orbital, $d\rightarrow d$ transition cannot take place, hence, $Zn^{+2} $ ions form colourless salts.
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