Q.

Among (A) TiF62−,(B)CoF63−,(C)Cu2Cl2 and (D) NiCl42− (atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are:

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a

(B) and (D)

b

(A) and (B)

c

(C) and (D)

d

(A) and (C)

answer is D.

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Detailed Solution

Completely filled d-orbital system or completely unfilled d-orbital system are colourless. Thus colour of a complex is explained on the basis of d-d transition
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Among (A) TiF62−,(B)CoF63−,(C)Cu2Cl2 and (D) NiCl42− (atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are: