Among the following compounds which is both paramagnetic and coloured?

K_{2} C r_{2} O_{7}

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[C o (S O_{4})]

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(N H_{4})_{2} [T i C l_{6}]

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K_{3} [C u (C N)_{4}]

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Solution

The correct option is A $[C o (S O_{4})]$
$C o (S O_{4}) \Rightarrow C o^{2 +} \to [A r] 3 d^{7}$
1. Paramagnetic.
2. And it is has red colour due to its unpaired electrons.

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