NTA Abhyas JEE Main2020ChemistryCoordination CompoundsPractice
The correct order of the calculated spin-only magnetic moments of complexes A to D is ( a ) Ni ( CO ) 4 ( b ) [ Ni H 2 O ) 6 C l 2 ( c ) N a 2 [ Ni ( CN ) 4 ] ( d ) PdC l 2 PP h 3 2
Options
- Ac < d < b < a
- Ba ≈ c < b ≈ d
- Ca ≈ c ≈ d < b
- Dc ≈ d < b < a
Correct answer
C. a ≈ c ≈ d < b
Step-by-step solution
a Ni ( CO ) 4 Ni = 3d 10 4s 0 S F L  ;   μ = 0 b [ Ni H 2 O ) 6 C l 2 Ni 2 + = 3d 8 Weak field ligand No. of unpaired electron = 2 μ = n n + 2 = 2 2 + 2 = 8 B . M c N a 2 [ Ni CN ) 4 N i 2 + – 3 d 8 S F L pairing take place (n = 0) μ = 0 d PdC l 2 PP h 3 2 P d 2 + = 4 d 8 square planar μ = 0