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Amongst \( \mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2} \) and \( \mathrm{NiCl}_{4}^{2-} \) the colourless species are :
\( \mathrm{P} \)
(a) \( \mathrm{CoF}_{6}^{3-} \) and \( \mathrm{NiCl}_{4}^{2-} \)
(b) \( \mathrm{TiF}_{6}^{2-} \) and \( \mathrm{CoF}_{6}^{3-} \)
W.
(c) \( \mathrm{Cu}_{2} \mathrm{Cl}_{2} \) and \( \mathrm{NiCl}_{4}^{2-} \)
(d) \( \mathrm{TiF}_{6}^{2-} \) and \( \mathrm{Cu}_{2} \mathrm{Cl}_{2} \)
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