(A) `O^(-)_2 -> O_2 + O_2^(2-)`
(B) `CrO_4^(2-) + H^(+) ->`
(C) `MnO_4^(-) + NO_2^(-) + H^(+) -> `
(D) `NO_3^(-) + H_2SO_4 + Fe^(2+) ->`
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(p) redox reaction
(q) one of the products has trigonal planar structure
(r) dimeric bridged tetrahedral metal ion
(s) disproportionation
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