JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
The orange colour of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and purple colour of \(\mathrm{KMnO}_4\) is due to _______.
- A Charge transfer transition in both.
- B \(d \rightarrow d\) transition in \(\mathrm{KMnO}_4\) and charge transfer transitions in \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_r\).
- C \(d \rightarrow d\) transition in \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and charge transfer transitions in \(\mathrm{KMnO}_4\).
- D \(\mathrm{d} \rightarrow \mathrm{d}\) transition in both.
Answer & Solution
Correct Answer
(A) Charge transfer transition in both.
Step-by-step Solution
Detailed explanation
\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \rightarrow \mathrm{Cr}^{+6} \rightarrow \text { No d - d transition }\) \(\mathrm{KMnO}_4 \rightarrow \mathrm{Mn}^{7+} \rightarrow \text { No d - d transition }\) Charge transfer
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