Question

H2O2(aq) + MgSO3(aq)  MgSO4(aq) + H2O

Precipitation gas formation acid-base neutralization redox

Answer 1

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Well sulfite, S(+IV) is oxidized to sulfate, S(+VI) …

SO2−3+H2O⟶SO2−4+2H++2e−

And hydrogen peroxide, O(−I) , is REDUCED to O(−II) in water…

H2O2(aq)+2H++2e−⟶2H2O(l)

And so add the former to the latter, and see what you gets… As always MASS and charge must be balanced ABSOLUTELY…