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(i) ( Fe^ 2+ +MnO_ 4 ^ - +H^ + longrightarrow Fe^ 3+ +Mn^ 2+ +H_ 2 O ) (ii) ( I_ 2 +S_ 2 O_ 3 ^ 2- longrightarrow S_ 4 O_ 6 ^ 2- +I^ - ) (iii) ( HCOOH+Na_ 2 CO_ 3 longrightarrow HC | Suva Ai