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$\underline{A}\overset{4KOH,O_{2}}{\rightarrow}2\underline{B}+2H_{2}O(Green)$

$3\underline{B}\overset{4HCl}{\rightarrow}2\underline{C}+MnO_{2}+2H_{2}O(Purple)$

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

In the above sequence of reactions, $\underline{A}$ and $\underline{D}$ , respectively, are :
Option 1)
$KIO_{3}\: and \: MnO_{2}$

Option 2)
$MnO_{2} \: and \: KIO_{3}$

Option 3)
$KI \: and \: KMnO_{4}$
Option 4)
$KI \: and \: K_{2}MnO_{4}$

Answers (1)

best_answer

Test of Manganese(2+) -

$Mn^{2+} + 2OH^{-} \rightarrow Mn(OH)_2$

$Mn(OH)_2$ react with an oxidising agent to form $MnO^{-}_4$ (purple)

$Mn(OH)_2 + PbO_2 \rightarrow Pb^{2+} + MnO^-_4$

- wherein

Purple color of $MnO^{-}_4$ confirm the $Mn^{2+}$

$2MnO_{2} (A)+4KOH+O_{2}\rightarrow 2K_{2}MnO_{4}(Green B)+2H_{2}O$

$3K_{2}MnO_{4}(B)+4HCl\rightarrow2K_{2}MnO_{4}(Purple C)+MnO_{2}+4KCl+2H_{2}O$ $2KMnO_{4}(c)+KI+H_{2}O\rightarrow2MnO_{2}(A)+KIO_{3}(c)+2KOH$

ag

Option 1)

$KIO_{3}\: and \: MnO_{2}$

Option 2)
$MnO_{2} \: and \: KIO_{3}$

Option 3)

$KI \: and \: KMnO_{4}$

Option 4)

$KI \: and \: K_{2}MnO_{4}$

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