Question

In which of the following ions, the colour is not due to $d-d$ transition?

• A. $\left[Ti\right(H_{2}O{)}_6{]}^{3+}$
• B. $\left[Cu\right(N{H}_3{)}_4{]}^{2+}$
• C. $[Co{F}_6{]}^{3-}$
• D. $Cr{O}_4^{2-}$

Answer 1

The correct option is D $Cr{O}_4^{2-}$

Colour is due to d-d transtition ,then such complexes have colour due to d-d transition are surely octahedral complexes.

Among the given options,

${\left[Ti{\left(H_{2}O\right)}_6\right]}^{3+}$

${\left[Cu{\left({NH}_3\right)}_4\right]}^{2+}$

${\left[{COF}_6\right]}^{3-}$

This are octahedral complexes.

$Cr{O}_4^{2-}$ is a salt,it colour is not due to d-d transition.