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Question

Traces of MnO−4 in conc. H2SO4 may change to:

A
Mn2O7
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B
MnO+3
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C
MnO2
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D
MnO24
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Solution

The correct option is B MnO+3
Mn2O7 arises as a dark green oil by the addition of concentrated H2SO4toKMnO4. The reaction initially produces permanganic acid, HMnO4 (structurally, HOMnO3), which is dehydrated by sulfuric acid to form its anhydride, Mn2O7.
2KMnO4+(cold)2H2SO4Mn2O7+H2O+2KHSO4
Mn2O7 can react further with sulfuric acid to give the remarkable cation MnO+3.


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