1.

{:(,"Column I",,"Column II"),(("A"),O_(2)^(-)rarrO_(2)+O_(2)^(2-),(p),"Redox reaction"),(("B"),CrO_(4)^(2-)+H^(+)rarr,(q),"one of the products has trigonal planar structure"),(("C"),MnO_(4)^(-)+NO_(2)^(-)+H^(+)rarr,(r),"dimeric bridged tetrahedral metal ion"),(("D"),NO_(3)^(-)+H_(2)SO_(4)+Fe^(2+)rarr,(s),"disproportionation"):}

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ANSWER :A::B::C::D


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