Magnetism in [Co(NH3)6]Cl3
Explanation of magnetism in [Co(NH3)6]Cl3 can be understood by analyzing the coordination complex of cobalt(III) hexammine chloride.

Coordination Complex
- [Co(NH3)6]Cl3 is a coordination complex where cobalt is coordinated to six ammine ligands and three chloride ions.
- The central cobalt ion has a d6 electronic configuration with six electrons in the d orbitals.

Paramagnetic Nature
- The coordination complex [Co(NH3)6]Cl3 is paramagnetic due to the presence of unpaired electrons in the d orbitals of cobalt.
- In an octahedral complex like [Co(NH3)6]Cl3, the d orbitals split into two sets - eg and t2g.
- The eg set will have higher energy and the t2g set will have lower energy.
- Since cobalt has six electrons in the d orbitals, there are four unpaired electrons in the t2g set, making the complex paramagnetic.

Magnetic Properties
- Paramagnetic substances are attracted to a magnetic field due to the presence of unpaired electrons.
- When [Co(NH3)6]Cl3 is placed in a magnetic field, the unpaired electrons align with the field, causing the complex to be attracted to the magnet.
- The paramagnetic nature of [Co(NH3)6]Cl3 can be confirmed by observing its behavior in the presence of a magnetic field.