MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryCoordination compoundsPrevious Year Questions
Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour? [CBSE AIPMT 2012]
A.[Co(NH3)6]
B.[Ni(NH3)6]✓ Correct
C.[Zn(NH3)6]
D.[Cr(NH3)6]
Explanation
2+ 3 2 3 6 Ni NH :sp d (outer) , octahedral, paramagnetic 2+ 3 2 3 6 Zn NH :sp d (outer) ,octahedral, diamagnetic 3+ 2 3 3 6 Cr NH :d sp (inner) ,octahedral, paramagnetic 3+ 2 3 3 6 Co NH :d sp (inner) , octahedral, diamagnetic Thus 2+ 3 6 Ni NH has an outer orbital complex and exhibits paramagnetic behavior. Hence, the second option is correct.
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