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Which statement regarding [Cr(NH3)6]^3+ is incorrect?(a) It has octahedral geometry(b) It has d^2sp^3 hybridisation(c) It is diamagnetic(d) It is a low spin complexI had been asked this question by my school teacher while I was bunking the class.This intriguing question originated from Bonding in Coordination Compounds topic in portion Coordination Compounds of Chemistry – Class 12

Answer»

The correct answer is (c) It is diamagnetic

Easiest explanation: Cr^3+ has six EMPTY orbitals- TWO 3d, one 4s and three 4p orbitals, which are OCCUPIED by six electron pairs from six NH3 molecules to form six d^2sp^3 hybridised orbitals. This leaves, three unpaired 3d electrons, making it paramagnetic. ALSO, since the inner d orbitals are involved, it is a low SPIN complex.



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