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(i) Name the element of 3d transition se...

(i) Name the element of 3d transition series which shows maximum number of oxidation states. Why does it show so ?
(ii) Complete the following equation : `MnO_(4)^(-) + 8H^(+) + 5e^(-) to ` .

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Mn, because of the presence of 5 unpaired electrons in 3d subshell.
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