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

(iv)\; Sc^{3+}

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No, aqueous solution of Sc^{3+} ion will have no colour because it has empty d-orbitals. Thus the d-d transition will ot happen (due absence of electron), which is responsible for colour.
The electronic configuration of Sc^{3+} =[Ar]^{18}3d^{0}4s^{0}

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manish

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