Q.
Assertion: The [Ni(en)3Cl2]Cl2 (en= ethylene diamine) has lower stability than [Ni(NH3)6Cl2] . Reason: In [Ni(en)3Cl2] the geometry of Ni is trigonal bipyramidal.
In [Ni(en)3]Cl2, ethylene diamine (en) is a bidentate ligand, hence it forms chela- ting ring with Ni2+ in. Chelates are comparatively more stable, hence [ Ni(en)3] Cl2 is more stable than [Ni(NH3)6]Cl2.