Which substance is the reducing agent in this reaction? 2kmno4+3na2so3+h2o→2mno2+3na2so4+2k oh

I believe Na2SO3  is the solution to the problem.

The reducing agent would be the substance that is oxidized in the reaction or the one who loses electrons. From the reaction given, it would be KMnO4 that is  the reducing agent. It loses electrons From (MnO4)2- to MnO2. Hope this answers the question.

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c. electrical charges of ionic bonds.

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