Question

Which of the following facts about the complex $\left[Cr{\left(N{H}_3\right)}_6\right]C{l}_3$ is worng?

• A. The complex involves $d^2{sp}^3$ hybridisation 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

The correct option is A The complex involves $d^2{sp}^3$ hybridisation and is octahedral in shape.

In the given complex $\left[Cr\right(N{H}_3{)}_6]C{l}_3$ the metal Cr in ground state have the configuration of $3d^{5}4s^1$ but in the complex, the metal is converted into Cr(+3) and its electronic configuration changes to $3d^{3}4s^0$. Now, according to the spectrochemical series the $N{H}_3$ ligand acts a weak field ligand and hence the pairing of electrons does not take place and therefore $N{H}_3$ donates its electron in $s{p}^3{d}^2$ orbitals and hence the hybridization of the complex is $s{p}^3{d}^2$, therefore, the wrong statement is A which in turn is the correct answer.