Q. Among the following the coloured compound is
A) $CuCl$
B) $K_{3}\lbrack Cu(CN)_{4}\rbrack$
C) ${CuF}_{2}$
D) $\left\lbrack Cu\left( {CH}_{3}CN \right)_{4} \right\rbrack{BF}_{4}$
Explanation
(c)
In ${CuF}_{2}$, ${Cu}^{2 +}$ ion exist, having $d^{9}$ configuration. Unpaired electron causes colour ($d - d$ transition). In the crystalline form, ${CuF}_{2}$ is blue coloured.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.