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Hagrid
Hi, this one is a redox reaction. which mean here substances have oxidized and reduced at the same time. When redox reactions happens the oxidation number of elements which participate for reaction change. 

Here, oxidation no.of Mn and S has changed. It means one out of (MnO4)-ion or (SO3)2- ion has either oxidised or reduced.

oxidizing no. of Mn in(MnO4)- ion has decreased from +8 to +4

oxidizing no. of S in SO# ion has increase from 4 to 6


So MnO4 has reduced. This means that the reducing agent is the (SO3)- ion

The reducing agent in this reaction is [tex](SO_3^{2-})[/tex] .

What is a redox reaction?

In this reaction one substance becomes oxidized and the other gets reduced at the same time. When redox reactions happens the oxidation number of elements which participate for reaction change.

From the chemical reaction:

[tex]2KMnO_4+3Na_2SO_3+H_2O-->2MnO_2+3Na_2SO_4+2KOH[/tex]

This reaction represents a redox reaction as here, oxidation number of Mn and S has changed. It means one out of  [tex](MnO_4^-)[/tex] ion or [tex](SO_3^{2-})[/tex] ion has either oxidized or reduced.

Oxidizing no. of Mn in [tex](MnO_4^-)[/tex]  ion has decreased from +8 to +4

Oxidizing no. of S in  [tex](SO_3^{2-})[/tex] ion has increased from 4 to 6.

So,     [tex](MnO_4^-)[/tex] has reduced.

Thus, the reducing agent is the  [tex](SO_3^{2-})[/tex] ion.

Find more information about Redox reaction here:

brainly.com/question/21851295

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