Question

5.
The magnetic property and the shape of
[Cr(NH3)6]3+complex ions are :
(1) Paramagnetic, Octahedral
(2) Diamagnetic, square planar
(3) Paramagnetic, tetrahedral
(4) None of the above
​

Answer 1

Answer:

3

Explanation:

Answer 2

The magnetic property and the shape of [Cr(NH₃)]³⁺ complex-ion are Paramagnetic and Octahedral.

• The donating molecule in the complex is (NH₃), which is a weak donor.
• The chromium is in a +3 oxidation state.
• The chromium ion (Cr³⁺) has the electronic configuration as 3d³.
• The donor molecule, thus, enters in two 3d-orbitals, 4-s orbital and 4-p orbitals.
• So, the hybridization of the complex-ion is d²sp³.
• Therefore, the shape of the complex -ion is octahedral.
• Hence, the correct answer is an option (1).