Question

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

विकल्प

• [Ni(NH₃)₆]²⁺

• [Zn(NH₃)₆]²⁺

• [Cr(NH₃)₆]³⁺

• [Co(NH₃)₆]³⁺

Answer 1

[Ni(NH₃)₆]²⁺

Explanation:

Ni²⁺ (d⁸) forms an outer orbital complex by using its 4d orbitals to bond with ligands. This complex is paramagnetic because Ni²⁺ has unpaired electrons.

Other complexes either use inner orbitals or do not have unpaired electrons, making them diamagnetic.