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Question

Which of the following compounds is/are coloured?

A
Cu2Cl2
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B
TiCl4
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C
Ce(SO4)2
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D
KMnO4
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Solution

The correct option is D KMnO4

Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions.

(KMnO4) is colored because it absorbs light in the visible range of the electromagnetic spectrum. The permanganate ion is the source of the color, as a ligand-to-metal charge transfer takes place between the oxygen's p-orbitals and the empty d-orbitals on the metal.

Electronic configuration of
Ce=[Xe]4f15d16s2
Ce+2=[Xe]4f15d1
Since it has unpaired electrons , Ce(SO4) exhibits yellow colour.

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