Assertion (A): Cuprous ion $({Cu}^{+})$ has unpaired electrons while cupric ion $({Cu}^{+ +})$ does not.
Reason (R): Cuprous ion ( Cu⁺ ) is colorless whereas cupric ion ( Cu⁺⁺ ) is blue in the aqueous solution

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A is false but R is true.

Both A and R are true and R is the correct explanation of A.

A is true but R is false.

Both A and R are true but R is not the correct explanation of A.

answer is C.

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Detailed Solution

Cuprous ions (Cu⁺) is colourless because it has no unpaired electrons in the 3d sub-shell as it has 3d¹⁰ configuration.
The cupric ion (Cu⁺⁺) has one unpaired electron as it has configuration 3d⁹.
By absorbing the visible light, the unpaired electron can migrate from one set of d- orbitals to another under the applied field of water molecules.
Hence, cupric ion (Cu⁺⁺) in aqueous solution shows blue color.