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