Question

Balance the redox reaction by half reaction method MnO4- + SO2 -->Mn2+ + HSO4- .In acidic nature

Answer 1

it will be answer of this question

Answer 2

Answer : The balanced redox reaction is, $2MnO_4^-+5SO_2+H^++2H_2O\rightarrow 2Mn^{2+}+5HSO_4^-$

Explanation :

In the half reaction method, the number of atoms in each half reaction and number of electrons should be balanced.

The half reactions in the acidic medium are :

$(1):MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O\\\\(2):SO_2+2H_2O\rightarrow HSO_4^-+3H^++2e^-$

Now multiply the equation by 2 and equation by 5 and then added both equation, we get the balanced redox reaction.

Thus, the balanced redox reaction will be,

$2MnO_4^-+5SO_2+H^++2H_2O\rightarrow 2Mn^{2+}+5HSO_4^-$