Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.

Chlorine is used to purify drinking water. Excess of chlorine is harmf

1.	Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
Answer» Solution :GIVEN redox reaction…. `OVERSET(0)(Cl_(2(s)))+overset(+4)(SO_(2(AQ)))+H_(2)O_((l))tooverset(-1)(Cl_((aq))^(-))+overset(+6)(SO_(4(aq))^(-2))` Half reaction … O.H.R. : `overset(+4)(SO_(2(aq)))tooverset(+6)(SO_(4(aq))^(-2))` R.H.R. : `overset(0)(Cl_(2(s)))tooverset(-1)(Cl_((aq))^(-))` Balancing while adding electron. O.H.R. : `SO_(2(aq))toSO_(4(aq))^(-2)+2e^(-)` R.H.R. : `Cl_(2(s))+2e^(-)to2Cl_((aq))^(-)` In O.H.R., balancing the H and O atom by `H_(2)O` and balancing according to MEDIUM and adding both the reaction.