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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df108

Select the correct reactions of acidified $KMnO X_{4}$ (dilute $H X_{2} SO X_{4}$ medium).

AIt oxidises oxalate to $CO X_{2}$ , with a mole ratio $MnO X_{4} X^{-} : C X_{2} O X_{4} X^{2 -} = 2 : 5$
BIt oxidises $H X_{2} S$ to sulfur
COne mole of $MnO X_{4} X^{-}$ oxidises 5 moles of $Fe X^{2 +}$
DIt is reduced to $MnO X_{2}$

Answer: A, B, C

(a)

2 MnO X_{4} X^{-} + 5 C X_{2} O X_{4} X^{2 -} + 16 H X^{+} \to 2 Mn X^{2 +} + 10 CO X_{2} + 8 H X_{2} O

: true. (b)

H X_{2} S

is oxidised to

S

: true. (c) 5 electrons per

MnO X_{4} X^{-}

and 1 per

Fe X^{2 +}

: true. (d) False: in acid the product is

Mn X^{2 +}

;

MnO X_{2}

forms in neutral medium.

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