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Out of TiF62-, CoF63-, CuCl2 and NiCl42- (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are:

1. CuCl2 and NiCl42-
2. TiF62- and CuCl2
3. CoF63- and NiCl42-
4. TiF62- and CoF63-

Correct answer: TiF62- and CoF63-

Solution

A species is colorless if it has no unpaired electrons in its d-orbitals. TiF6²⁻ (d⁰) and CoF6³⁻ (d⁶, low spin in strong field) are colorless due to the absence of unpaired electrons.

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