Question

Out of TiF₆^2-, CoF₆^3-, Cu₂Cl₂ and NiCl₄^2- (Z of Ti = 22, Co = 27 , Cu = 29, Ni = 28) the colourless species are

(a) Cu₂Cl₂ and NiCl₄^2-

(b) TiF₆^2- and Cu₂Cl₂

(c) CoF₆^3- and NiCl₄^2-

(d) TiF₆^2- and CoF₆^3-

Answer 1

Correct option (b) TiF₆^2- and Cu₂Cl₂

Explanation :

A species is coloured when it contains unpaired d-electrons which are capable of undergoing d-d transition on adsorption of light of a particular wavelength.