Question
Explain why chlorine is used for sterilising drinking water supply.
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$2\text{NaCl}+2\text{H}_2\text{O}\xrightarrow{\text{Electric current}}2\text{NaOH}+2\text{Cl}_2+\text{H}_2$
$\text{Ca(OH)}_2+\text{Cl}_2\rightarrow\text{CaOCl}_2+\text{H}_2\text{O}$