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JEE Main levelSingle correct optionDifficulty 2 of 3df136

The green manganate ion $MnO X_{4} X^{2 -}$ is:

Aparamagnetic, with five unpaired electrons
Bdiamagnetic, with no unpaired electron
Cparamagnetic, with two unpaired electrons
Dparamagnetic, with one unpaired electron

Answer: D

Manganese in

MnO X_{4} X^{2 -}

is +6, which is

3 d^{1}

. This gives one unpaired electron and

μ = 1.73 BM

.

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