Outer orbital complex utilises nd orbitals for bonding and exhibit paramagnetic behaviour, only if there present unpaired electrons. (a) In[Ni(NH3)6]2+:Ni2+=[Ar]3d84s0 
So, this is an outer orbital complex having paramagnetic character. (b) In [Zn(NH3)6]2+ : Zn2+=[Ar]3d10 
Thus, it is also an outer orbital complex but it is diamagnetic as all the electrons are paired. (c) In[Cr(NH3)6]3+Cr3+=[Ar]3d3[Cr(NH3)6]3+= 
Because of the involvement of (n−1)d, i.e., 3d orbital in hybridisation, it is an inner orbital complex. Its nature is paramagnetic because of the presence of three unpaired electrons. (d) In[Co(NH3)6]3+ : Co3+=[Ar]3d6 
As all the electrons are paired, it is a diamagnetic complex.
Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
NEET UG 2012 — Chemistry Inorganic Chemistry
2012mcqmedium
Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
Official previous-year question
Held on 30 Apr 2012 · Verified 9 Jul 2026.
Options
- A
[Ni(NH3)6]2+
- B
[Zn(NH3)6]2+
- C
[Cr(NH3)6]3+
- D
[Co(NH3)6]3+
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