WBJEE · Chemistry · d and f Block Elements
Which of the following species exhibits both LMCT and paramagnetism?
- A \(\mathrm{MnO}_4^{2-}\)
- B \(\mathrm{MnO}_4^{-}\)
- C \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\)
- D \(\mathrm{CrO}_4^{2-}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{MnO}_4^{2-}\)
Step-by-step Solution
Detailed explanation
Hint: \(\mathrm{MnO}_4{ }^{-2}\) ion exhibits colour due to charge transfer from \(\mathrm{O}^{2-}\) ion to \(\mathrm{Mn}^{+6}(\mathrm{LMCT})\) and also exhibits paramagnetism as it has \(3 \mathrm{~d}^4\) configuration (one unpaired electron)
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