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

Step-by-step solution

Outer orbital complex utilises nd orbitals for bonding and exhibit paramagnetic behaviour, only if there present unpaired electrons. aligned & (a) In [ Ni ( NH ₃ )₆ ]²⁺: & Ni ²⁺=[ Ar ] 3 d^8 4 s^0 aligned So, this is an outer orbital complex having paramagnetic character. (b) In [ Zn ( NH ₃ )₆ ]²⁺ : Zn ²⁺=[ Ar ] 3 d¹⁰ Thus, it is also an outer orbital complex but it is diamagnetic as all the electrons are paired. gathered (c) In [ Cr ( NH ₃ )₆ ]³⁺ Cr ³⁺=[ Ar ] 3 d^3 [ Cr ( NH ₃ )₆ ]³⁺= gathered Because of the invol