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

The colorless species are TiF62− and Cu2Cl2Cu2Cl2 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.

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

The colorless species are TiF62− and Cu2Cl2Cu2Cl2 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

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

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

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

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

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.