Coordination Compounds

Coordination Compounds

Question

Which of the following facts about the complex [Cr(NH3)6]Cl3 is wrong?

  • The complex involves d2sp3 hybridisation and is octahedral in shape.

  • The complex is paramagnetic. 

  • The complex is an outer orbital complex. 

  • The complex gives a white precipitate with silver nitrate solution.

Answer

C.

The complex is an outer orbital complex. 

In the case of d3 configuration, the number of unpaired electrons remains 3 whether the ligand is strong field or weak field. The hybridization scheme can be shown as follow :

Hence the complex is inner orbital complex as it involves (n - 1) d orbitals for hybridization, 3.93 = √n(n + 2) ; so n = 3 (where n is number of unpaired electron(s)).

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