Using valence bond theory , the complex `[Cr(H_(2)O)_(6)]^(3+)` can be described as

Options

A. `sp^(3) d^(2)` , outer orbital complex , paramagnetic
B. `dsp^(2)` , inner orbital complex , diamagnetic
C. `d^(2) sp^(3)` , inner orbital complex , paramagnetic
D. `d^(2) sp^(3)` , outer orbital complex , diamagnetic .

Answer

C

Explanation

In `[Cr(H_(2)O)_(6)]^(3+)` , oxidation state of `Cr = + 3 , Cr^(3+) = 3d^(3)`

It is an inner orbital complexes . Due to presence of three unpaired electrons , it is paramagnetic .