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  4. Which of the following molecules is colorless?

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Q. Which of the following molecules is colorless?

TS EAMCET 2020

Solution:

Hydrated copper sulphate $CuSO _{4} \cdot 5 H _{2} O$ is blue in colour. The ligand (water) molecules causes splitting of $d$-orbitals.
This facilitated $d-d$ transition and colour.
Anhydrous copper sulphate $CuSO _{4}$ is colourless. In the absence of ligand (water) molecules, splitting of $d$-orbitals is not possible.
Hence, $d-d$ transition is not possible.