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

Reducing agent:

Explanation:

Reducing species is a chemical species which itself undergoes oxidation and reduces other chemical species in a redox reaction.

Oxidation state of each element is:

Before the reaction                                           After the reaction

Oxidation state of K = +1                       Oxidation state of Mn = +4

Oxidation state of Mn = +7                      Oxidation state of O = -2

Oxidation state of O = -2                                      

Before the reaction                                           After the reaction

Oxidation state of Na = +1                   Oxidation state of Na = +1

Oxidation state of S = +4                      Oxidation state of S = +6

Oxidation state of O = -2                        Oxidation state of O = -2

Only oxidation states of S and Mn are changes during the reaction.

Oxidation of Mn is decreased and oxidation number of S is increased during the reaction. Hence, undergoes oxidation, so acts as reducing agent.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .