JEE Main 12 Jan 2019 Morning Question 26

Question: The pair of metal ions that can give a spin- only magnetic moment of 3.9 B.M. for the complex $ [M{{(H _2O)}_6}]Cl _2 $ is [JEE Main Online Paper Held On 12-Jan-2019 Morning]

Options:

A) $ C{r^{2+}}and,M{n^{2+}} $

B) $ {V^{2+}}and,C{o^{2+}} $

C) $ {V^{2+}}and,F{e^{2+}} $

D) $ C{o^{2+}}and,F{e^{2+}} $

Show Answer

Answer:

Correct Answer: B

Solution:

  • As ${H_2O}$ is a weak field ligand. It readily forms high spin complexes. In $[M(H_2O)_6]CI_2$ , M exist in +2 oxidation state.