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

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Chlorine Purification of Water: Excess chlorine in drinking water is harmful to human health. Chlorine reacts with organic matter and forms disinfection by-products (DBPs) such as chloramines and trihalomethanes, which are carcinogenic. To remove excess chlorine, it is treated with sulphur dioxide...
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  1. Chlorine Purification of Water: Excess chlorine in drinking water is harmful to human health. Chlorine reacts with organic matter and forms disinfection by-products (DBPs) such as chloramines and trihalomethanes, which are carcinogenic. To remove excess chlorine, it is treated with sulphur dioxide (SO2SO2):

Cl2+SO2+H2O→HCl+H2SO4Cl2+SO2+H2O→HCl+H2SO4

In this reaction, chlorine (Cl2Cl2) is reduced to hydrochloric acid (HClHCl), while sulphur dioxide (SO2SO2) is oxidized to sulfuric acid (H2SO4H2SO4).

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