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8.18 Predict for the following, will be coloured in an aqueous solution. Give reason.

(iii)\; Cu^{+}

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No, Cu^{+} aqueous solution has no colour because it has fully filled d-orbitals. So, that d-d transition will not happen, which is responsible for colour.
electronic configuration of Cu^{+}[Ar]^{18}3d^{10}4s^{0}

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