Question

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

• A. The complex involves d2sp3hybridisation and is octahedral in shape.
• B. The complex is paramagnetic.
• C. The complex is an outer orbital complex.
• D. The complex gives white precipitate with silver nitrate solution.

Answer 1

Answer: (C)

The complex is an outer orbital complex.

Answer 2

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

[Cr(NH3)3]3+ =

Hence the complex is inner orbital complex as it involves (n – 1) d orbitals for hybridisation,

3.93 = $\sqrt{n(n + 2)}$; so n = 3 (here n is number of unpaired electron(s)).