Question

Which of the following reaction is reducing agent? SO2+2H2O+Br2=H2SO4+2HBr​

Answer 1

Answer:

Br2+SO2+2H2O=2HBr+H2SO4

To find out the oxidation and reduction in a chemical reaction, first write the oxidation state (O) n of all the elements in both the reactant side and product side.Remember that the (O)n state of an element is always 0.

Reactant side ——————— product side

Element _( O)n state--Element _ (O)n state

Br_______0. Br ———— (- 1)

S-------------(+4)S-------------(+)

H________(+1)H________(+1)

O________(-2)O________(-2)

There is no change in the oxidation state of H and O

Only the oxidation state of

Br has changed from 0 to -1 addition of 1 electron. Gain of electron is reduction (GER)

S has changed from +4 to +7. Removal of 3electrons. Loss of electron is oxidation (LEO)