Question

Which pair of compounds is expected to show similar colour in aqueous medium?

(a) FeCl₃ and CuCl₂

(b) VoCl₂ and CuCl₂

(c) COCl₂ and FeCl₂

(d) FeCl₂ and MnCl₂

Answer 1

The correct option (b) VoCl₂ and CuCl₂

Explanation:

Colour of transition metal ion salt is due to d-d-transition of unpaired electrons of d-orbital. Metal ion salt having similar number of unpaired electrons in d-orbitals shows similar colour in aqueous medium. 

In VOCI₂ vanadium is present as V⁴⁺ and in CuCl₂, copper is present as Cu²⁺