D And F Block Elements Question 14
Question 14 - 2024 (30 Jan Shift 2)
The orange colour of $K _2 Cr _2 O _7$ and purple colour of $KMnO _4$ is due to
(1) Charge transfer transition in both.
(2) $d \rightarrow$ d transition in $KMnO _4$ and charge transfer transitions in $K _2 Cr _2 O _7$.
(3) $d \rightarrow d$ transition in $K _2 Cr _2 O _7$ and charge transfer transitions in $KMnO _4$.
(4) $d \rightarrow d$ transition in both.
Show Answer
Answer (1)
Solution
$\left.\begin{array}{c}\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \rightarrow \mathrm{Cr}^{+6} \rightarrow \text { No d-d transition } \\ \mathrm{KMnO}_4 \rightarrow \mathrm{Mn}^{7+} \rightarrow \text { No d-d transition }\end{array}\right\}$ Charge transfer
