Consider the reaction: ${\mathrm{H}}_2{\mathrm{SO}}_3\left(\mathrm{aq}\right)+{\mathrm{Sn}}^{4+}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to {\mathrm{Sn}}^{2+}\left(\mathrm{aq}\right)+3{\mathrm{H}}^{+}\left(\mathrm{aq}\right)+{\mathrm{HSO}}_4^{-}$

Which of the following statements is correct?

The oxidation number of sulphur in H2​SO3​ is +4 and it get oxidises to +6 in HSO4−​. 

Sn4+ get reduced to Sn2+ in the given reaction. 

We can say that H2​SO3​ is the reducing agent because it undergoes oxidation.

The reaction along with the oxidation number of species undergone oxidation and reduction is as follows.