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Colour

Which of the ...

Question

Which of the following species is expected to be colorless?

[T i (H_{2} {O)}_{6}]^{+ 3}

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[T i ({N O}_{3})_{6}]^{- 3}

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[C r ({N H}_{3})_{6}]^{+}

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[F e ({C N})_{6}]^{- 4}

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Solution

The correct options are
A $[T i (H_{2} {O)}_{6}]^{+ 3}$
C $[C r ({N H}_{3})_{6}]^{+}$
In the given complexes, The complex $[C r (N H_{3})_{6}]^{+}$ is colorless. this is because the electronic configuration of Cr is $3 d^{5} 4 s^{1}$ but Cr(+1) has the electronic configuration of $d^{5}$ and in such a configurations d-d transitions are not possible and hence the complex is colorless.Hence the correct option is C.

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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

S F_{6}

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{A l F_{6}}^{3 -}

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S C l_{6}

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S e F_{6}

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