Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
Question
$\ce{CuSO_4⋅5H_2O}$ is blue is colour while $\ce{CuSO_4}$ is colourless due to$:$
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Answer
In $\ce{CuSO_4⋅5H_{2}O},$ water acts as ligand and causes crystal filed splitting.
This makes $d - d$ transitions possible.
On the other hand, in $\ce{CuSO_4},$ due to absence of ligand crystal filed splitting is not possible.
Hence no colour is observed.
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