Amongst \( \mathrm{TiF}_{6}{ }^{2-} \mathrm{CoF}_{6}{ }^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2} \)...
Amongst \( \mathrm{TiF}_{6}{ }^{2-} \mathrm{CoF}_{6}{ }^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2} \) and \( \mathrm{NiCl}_{4}{ }^{2-}(\mathrm{At} \). Nos. \( \mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28) \), the colourless species are
(A) \( \mathrm{TiF}_{6} \)-and \( \mathrm{Cu}_{2} \mathrm{Cl}_{2} \)
(B) \( \mathrm{Cu}_{2} \mathrm{Cl}_{2} \) and \( \mathrm{NiCl}_{4}{ }^{2-} \)
(C) \( \mathrm{TiF}_{6}{ }^{2-} \) and \( \mathrm{CoF}_{6}{ }^{3-} \)
(D) \( \mathrm{CoF}_{6}{ }^{3-} \) and \( \mathrm{NiCl}_{4}{ }^{2-} \)
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