The aqueous solution of the salt 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 option is D $C r C l_{3}$
Both $C o^{2 +}$ as well as $C r^{3 +}$ are coloured. The former is blue and the latter is blue-green. This is largely due low-energy $d - d$ transitions.

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