A) \[\text{Mn}{{\text{O}}_{\text{2}}}\text{,KMn}{{\text{O}}_{\text{4}}}\text{ and }{{\text{K}}_{\text{2}}}\text{Mn}{{\text{O}}_{\text{4}}}\]
B) \[~\text{Mn}{{\text{O}}_{2}}\text{, }{{\text{K}}_{\text{2}}}\text{Mn}{{\text{O}}_{\text{4}}}\text{ and KMn}{{\text{O}}_{\text{4}}}\]
C) \[\text{KMn}{{\text{O}}_{\text{4}}},\text{ Mn}{{\text{O}}_{2}}\text{ and }{{\text{K}}_{\text{2}}}\text{Mn}{{\text{O}}_{\text{4}}}\]
D) \[\text{KMn}{{O}_{\text{4}}},\text{ }{{\text{K}}_{\text{2}}}\text{Mn}{{\text{O}}_{\text{4}}}\text{ and Mn}{{\text{O}}_{\text{2}}}\]
Correct Answer: B
Solution :
\[\underset{\text{(Black) A}}{\mathop{\text{Mn}{{\text{O}}_{\text{2}}}}}\,\text{+KOH + KN}{{\text{O}}_{\text{3}}}\xrightarrow{\text{ }\!\!\Delta\!\!\text{ }}{{\text{K}}_{\text{2}}}\underset{\text{Green}}{\mathop{\text{Mn}{{\text{O}}_{\text{4}}}}}\,\text{(B)}\] \[\text{C}{{\text{O}}_{2}}+{{H}_{2}}O\rightleftharpoons {{H}_{2}}C{{O}_{3}}\rightleftharpoons {{H}^{+}}HCO_{3}^{-}\] \[\underset{\text{B}}{\mathop{\text{3MnO}_{\text{4}}^{\text{2-}}}}\,\text{+4}{{\text{H}}^{\text{+}}}\to \underset{\text{A}}{\mathop{\text{Mn}{{\text{O}}_{\text{2}}}}}\,\text{+}\underset{\text{C}}{\mathop{\text{2MnO}_{\text{4}}^{\text{-}}}}\,\text{+2}{{\text{H}}_{\text{2}}}\text{O}\]
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