Amongst $T i F_{6}^{2 -}, C o F_{6}^{3 -}, {C u}_{2} {C l}_{2}$ and $N i {C l}_{4}^{2 -}$

(At. No. of $T i = 22, C o = 27, C u = 29, N i = 28$ ). The colourless species are :

C o F_{6}^{3 -}

and

N i {C l}_{4}^{2 -}

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T i F_{6}^{2 -}

and

C o F_{6}^{3 -}

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{C u}_{2} {C l}_{2}

and

N i {C l}_{4}^{2 -}

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T i F_{6}^{2 -}

and

{C u}_{2} {C l}_{2}

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Solution

The correct option is D $T i F_{6}^{2 -}$ and ${C u}_{2} {C l}_{2}$
The colourless species are $T i F_{6}^{2 -}$ and ${C u}_{2} {C l}_{2}$

$C u_{2} c l_{2}$ is $2 (C u C l)$ and hence is diamagnetic. So it is colourless.

$T i$ in $T i F_{6}^{2 -}$ has no d electrons,so no colour as no $d - d$ transition takes place.

Hence, the correct option is $D$

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