Traces of $M n O_{4}^{-}$ in conc. $H_{2} S O_{4}$ may change to:

M n_{2} O_{7}^{-}

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M n O_{3}^{+}

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M n O_{2}

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M n O_{4}^{2 -}

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Solution

The correct option is B $M n O_{3}^{+}$
$M n_{2} O_{7}$ arises as a dark green oil by the addition of concentrated $H_{2} S O_{4} t o K M n O_{4}$ . The reaction initially produces permanganic acid, $H M n O_{4}$ (structurally, $H O M n O_{3}$ ), which is dehydrated by sulfuric acid to form its anhydride, $M n_{2} O_{7}$ .
$2 K M n O_{4} + (c o l d) 2 H_{2} S O_{4} M n_{2} O_{7} + H_{2} O + 2 K H S O_{4}$
$M n_{2} O_{7}$ can react further with sulfuric acid to give the remarkable cation $M n O_{3}^{+}$ .

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