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  2. I need help with - In the above sequence of reactions,and, respectively, are : - Principles Related to Practical Chemistry - JEE Main
# Engineering

\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)
A admin

 

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}O2KMnO_{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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