chlorine is poisonous then how it purifies water without making the water poisonous

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Solution

Chlorine is used to purify drinking water. Chlorine is very effective for the deactivation of pathogenic microorganisms, so it is added into water to kill the pathogens. An optimum level of chlorine is used as an disinfectant to purify water. Chlorine tablets are used for this purpose. Before delivery to home the chlorine level is checked in water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide.

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