JEE Main20209 Jan 2020Evening ShiftChemistryCoordination CompoundsActual
The correct order of the spin-only magnetic moments of the following complexes is: ( I ) C r H 2 O 6 B r 2 ( I I ) N a 4 F e ( C N ) 6 ( I I I ) N a 3 F e C 2 O 4 3 Δ 0 > P ( I V ) E t 4 N 2 C o C l 4
Options
- AI I I > I > I V > I I
- BI I I > I > I I > I V
- CI > I V > I I I > I I
- DI I ≈ I > I V > I I I
Correct answer
C. I > I V > I I I > I I
Step-by-step solution
As μ s = n n + 2 Complex (II) → Fe + 2 ⟹ S . F . L ⟹ t 2 g 2 ,2 , 2 eg 0 ,0 ⟹ μ s = 0 Complex (I) → Cr + 2 ⇒ W . F . L ⇒ t 2 g 1 ,1 , 1 eg 1 ,0 ⇒ μ s = 24 B . M Complex (IV) → Co + 2 ⇒ W . F . L ⇒ e g 2 ,2 , t 2 g ^ 1 ,1 , 1 , ⇒ μ s = 15 B . M Complex (III) → Fe + 3 ⇒ S . F . L ⇒ t 2 g 1 ,1 , 1 eg 0 ,0 ⇒ μ s = 3 B . M