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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df109

Select the correct statements regarding the preparation of potassium permanganate.

AFusing $MnO X_{2}$ with KOH in the presence of air gives green $K X_{2} MnO X_{4}$
BOxidation of $K X_{2} MnO X_{4}$ with $Cl X_{2}$ gives $KMnO X_{4}$
CIn neutral or acidic solution $K X_{2} MnO X_{4}$ disproportionates to $KMnO X_{4}$ and $MnO X_{2}$
DChromite is the starting ore for its manufacture

Answer: A, B, C

(a)

2 MnO X_{2} + 4 KOH + O X_{2} \to 2 K X_{2} MnO X_{4} + 2 H X_{2} O

: true. (b)

2 K X_{2} MnO X_{4} + Cl X_{2} \to 2 KMnO X_{4} + 2 KCl

: true. (c)

3 MnO X_{4} X^{2 -} + 4 H X^{+} \to 2 MnO X_{4} X^{-} + MnO X_{2} + 2 H X_{2} O

: true. (d) False: the ore is pyrolusite (

MnO X_{2}

); chromite is used for dichromate.

Practice d- and f-Block Elements More on Important compounds: KMnO4 and K2Cr2O7

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