See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

The ionic equation involved is          4 2 4 MnO aq SO g H aq Mn aq HSO aq         The balanced equation is           4 2 2 4 2MnO aq 5SO g 2H O H aq 2Mn aq 5HSO aq            Sum total of coefficient(s) = 2 + 5 = 7.