Problem

Problem

Amongst

\text{TiF}_6^{2-}

,

\text{CoF}_6^{3-}

,

\text{Cu}_2\text{Cl}_2

and

\text{NiCl}_4^{2-}

the colourless species are : a.

\text{CoF}_6^{3-}

and

\text{NiCl}_4^{2-}

b.

\text{TiF}_6^{2-}

and

\text{CoF}_6^{3-}

c.

\text{Cu}_2\text{Cl}_2

and

\text{NiCl}_4^{2-}

d.

\text{TiF}_6^{2-}

and

\text{Cu}_2\text{Cl}_2

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