Question

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

• 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 1

Answer: (C)

In $[Cr(H_{2}O )_{6}]^{3+}$ , oxidation state of $Cr = +3, Cr^{3+} = 3d^{3}$
$[Cr(H_{2}O)_{6}]^{3+}$ :
It is an inner orbital complex. Due to presence of three unpaired electrons, it is paramagnetic