The aqueous solution of the following salts will be colored in the case of _________.

Z n (N O_{3})_{2}

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L i N O_{3}

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C o (N O_{3})_{2}

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C r C l_{3}

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Solution

The correct options are
C $C o (N O_{3})_{2}$
D $C r C l_{3}$
As only $C o (N O_{3})_{2}$ ( $d^{7}$ configuration of $C o^{2 +}$ ) and $C r C l_{3}$ ( $d^{3}$ configuration of $C r^{3 +}$ ) have d electrons for d-d transition, so they will show colour and other compounds will not show any colour.

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