JEE MAIN - Chemistry (2020 - 4th September Morning Slot - No. 5)
The pair in which both the species have the
same magnetic moment (spin only) is :
[Cr(H2O)6]2+ and [CoCl4]2–
[Co(OH)4]2– and [Fe(NH3)6]2+
[Mn(H2O)6]2+ and [Cr(H2O)]2+
[Cr(H2O)6]2+ and [Fe(H2O)6]2+
Explanation
Species with same number of unpaired
electrons have equal magnetic moment.
| Complex | Ligand | Ligand Type | Number of unpaired electrons |
|---|---|---|---|
| [Mn(H2O)6]2+ | H2O | Weak Field Ligand | 5 |
| [Cr(H2O)]2+ | H2O | Weak Field Ligand | 4 |
| [CoCl4]2– | Cl | Weak Field Ligand | 3 |
| [Fe(H2O)6]2+ | H2O | Weak Field Ligand | 4 |
| [Co(OH)4]2– | OH | Weak Field Ligand | 3 |
| [Fe(NH3)6]2+ | NH3 | Weak Field Ligand | 4 |
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