Hi Vedas,
To balance this redox reaction we will use the hydrogen ion support.
he Mn is changing from7 valency to 2 valency.
This reaction can be balanced as2MnO^−4 + H^+ + 5SO2 + 2H2O → 2Mn2^+ + 5HSO^−4.
Feel free to ask doubts in the Comment Section.
I hope this information helps you.
Good Luck!
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