Consider the following complex ions, P, Q and R. P = [FeF6]3–, Q = [V(H2O)6]2+ and R = [Fe(H2O)6]2+, the correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is:

Engineering

Chemistry

Crystal Field Theory and Valence Bond Theory

Question

Consider the following complex ions, P, Q and R.

P = [FeF₆]^3–, Q = [V(H₂O)₆]²⁺ and R = [Fe(H₂O)₆]²⁺,

the correct order of the complex ions, according to their spin only magnetic moment values (in B.M.) is:

Q < P < R

R < Q < P

R < P < Q

Q < R < P

College PredictorLive

Know your College Admission Chances Based on your Rank/Percentile, Category and Home State.

Get your JEE Main Personalised Report with Top Predicted Colleges in JoSA

(P) [FeF₆]^–3 $\to$ Fe⁺³ $\to$ d5 configuration with WFL

unpaired electron = 5

(Q) [V(H₂O)₆]²⁺ $\to$ V⁺² $\to$ d³ configuration

unpaired electron = 3

(R) [Fe(H₂O)₆]²⁺ $\to$ Fe⁺² $\to$ d⁶ configuration with WFL

unpaired electron = 4

Spin only magnetic moment (µ) = $\sqrt{n (n + 2)}$ B.M. (n = unpaired electron)

So, µ of P > R > Q