In the above sequence of reactions, A and D ,respectively are

Engineering

Chemistry

Dichromate and Permanganate Ion Reactions

Question

$\underline{A} \overset{4 KOH, O_{2}}{\to} \underset{(green)}{2 \underline{B}} + 2 H_{2} O$

$3 \underline{B} \overset{4 HCl}{\to} \underset{(purple)}{2 \underline{C}} + {MnO}_{2} + 2 H_{2} O$

$2 \underline{C} \overset{H_{2} O, KI}{\to} 2 \underline{A} + 2 KOH + \underline{D}$

In the above sequence of reactions, A and D ,respectively are

KI and K₂MnO₄

MnO₂ and KIO₃

KIO₃ and MnO₂

KI and KMnO₄

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${MnO}_{2} \overset{4 KOH, O_{2}}{\to} \underset{(Green)}{2 K_{2} {MnO}_{4}} + 2 H_{2} O$

$3 K_{2} {MnO}_{4} \overset{4 HCl}{\to} \underset{(Purple)}{2 {KMnO}_{4}} + {MnO}_{2} + 2 H_{2} O$

$3 {KMnO}_{4} \overset{H_{2} O, KI}{\to} 2 {MnO}_{2} + 2 KOH + {KIO}_{3}$