question_answer

Which pair of compound is expected to show similar colour in aqueous medium [IIT Screening 2005]

A) \[FeC{{l}_{2}}\] and \[CuC{{l}_{2}}\]

B) \[VOC{{l}_{2}}\,\text{and }CuC{{l}_{2}}\]

C) \[VOC{{l}_{2}}\text{ and }FeC{{l}_{2}}\]

D) \[FeC{{l}_{2}}\text{ and }MnC{{l}_{2}}\]

Correct Answer: B

Solution :

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 similar number of unpaired electron in d-orbitals shows similar colour in aqueous medium Number of unpaired electrons = 1