Oxidation and reduction process involves the transaction of electrons. Loss of electrons is oxidation and the gain of electrons is reduction. It is thus obvious that in a redox reaction, the oxidant is reduced by accepting the electrons and the reductant is oxidised by losing electrons. The reactions in which a species disproportionates into two oxidation states (lower and higher) are called disproportionation reactions. In electrochemical cells, redox reaction is involved, i.e., oxidation takes place at anode and reduction at cathode.
Detennine the change in oxidation number of sulphur in `H_(2)S and SO_(2)` respectively in the following reaction:
`2H_(2)S+SO_(2) to 2H_(2)O+3S`

Options

A. 0,+2
B. `+2,-4`
C. `-2,+2`
D. `+4,0`

Answer

B