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  4. The colour and magnetic nature of manganate ion (MnO2-4) is

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Q. The colour and magnetic nature of manganate ion $(MnO^{2-}_4)$ is

MHT CETMHT CET 2017The d-and f-Block Elements

Solution:

In $MnO_4^{-2}$ oxidation state of $Mn$ is $+6$
Its electronic configuration is $1 s^{2} 2 s^{2} 2p^{6} 3 s^{2} 3 p^{6} 3 d^{1}, 4 s^{0}$
Due to presence of unpaired electron it is coloured and paramagnetic. And it's colour is purple.