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Q.

Among [TiF₆]^2–, [CoF₆]^3–, Cu₂Cl₂ and [Ni(Cl₄]^2–, the colourless species are

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a

${[{NiCl}_{4}]}^{2 -} and {Cu}_{2} Cl 2$

b

${[{TiF}_{6}]}^{2 -} and {[{CoF}_{6}]}^{3 -}$

c

${[{CoF}_{6}]}^{3 -} and {[{NiCl}_{4}]}^{2 -}$

d

${[{TiF}_{6}]}^{2 -} and {Cu}_{2} {Cl}_{2}$

answer is D.

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Detailed Solution

The colorless species are TiF₆²⁻ and Cu₂Cl₂
Cu₂Cl₂ is a dimer of CuCl. There is only one unpaired electron in CuCl and after dimerization, there is no unpaired electron. Hence, it is diamagnetic and colorless.
Ti in TiF₆²⁻ has no d electrons, so it is also colorless.

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Among [TiF6]2–, [CoF6]3–, Cu2Cl2 and [Ni(Cl4]2–, the colourless species are