एक रसायन जिसका प्रयोग पेय जल के शुद्धिकरण में किया जाता है? A chemical which is used to purify the drinking water?

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एक रसायन जिसका प्रयोग पेय जल के शुद्धिकरण में किया जाता है? A chemical which is used to purify the drinking water?