A) \[KMn{{O}_{4}}\], purple green
B) \[KMn{{O}_{4}}\], purple
C) \[M{{n}_{2}}{{O}_{3}}\], brown
D) \[M{{n}_{2}}{{O}_{4}}\], black
Correct Answer: A
Solution :
\[2Mn{{O}_{2}}+4KOH+{{O}_{2}}\xrightarrow{{}}\underset{\begin{smallmatrix} purple \\ green \end{smallmatrix}}{\mathop{2{{K}_{2}}Mn{{O}_{4}}}}\,+2{{H}_{2}}O\]
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