Which of the following compounds show colour due to $d-d$ transition?
Which of the following compounds show colour due to $d-d$ transition?
- [JEE MAIN 2024]
- A
$\mathrm{CuSO}_4 .5 \mathrm{H}_2 \mathrm{O}$
- B
$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
- C
$\mathrm{K}_2 \mathrm{CrO}_4$
- D
$\mathrm{KMnO}_4$
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- [JEE MAIN 2020]