Choose the correct answer from the alternative given.
Amongst $T i F_{6}^{2 -}$ , $C o F$ , $C u_{2}$ $C l_{2}$ and $N i C l$ , which are the colourless species? (atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28)

C o F_{6}^{3 -}

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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C u_{2} C l_{2}

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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Solution

The correct option is A $T i F_{6}^{2 -}$ and $C u_{2} C l_{2}$
TiF $_{6}^{2 -}$ -
The oxidation state of Ti is +4.
Electronic configuration of Ti $^{4 +}$ is [Ar] 3d $^{0} 4 s^{0}$ .
So, unpaired e $^{-}$ s is present in d-orbitals so it is colourless.
Cu $_{2} C l_{2}$ -
The oxidation state of Cu is +1.
Electronic configuration of Cu $^{+}$ is [Ar] 3d $^{10} 4 s^{0}$ .
So, no unpaired d e $^{-}$ s are present . Hence, the given compound is colourless.

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Similar questions

T i F_{6}^{2 -}, C o F_{6}^{3 -}, C u_{2} C l_{2}

N i C l_{4}^{2 -}

T i F_{6}^{2 -}, C o F_{6}^{3 -}, C u_{2} C l_{2}

N i C l_{4}^{2 -}

T i F_{6}^{2 -}, C o F_{6}^{3 -}, C u_{2} C l_{2}

N i C l_{4}^{2 -}

T i F_{6}^{2 -}, C o F_{6}^{3 -}, {C u}_{2} {C l}_{2}

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

T i = 22, C o = 27, C u = 29, N i = 28

Among $T i F_{6}^{2 -}, C o F_{6}^{3 -}, C u_{2} C l_{2} a n d N i C l_{4}^{2 -}$ the colorless species are

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