Why heavy water is stored in dark coloured bottle
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Because in the presence of sunlight, atmospheric oxygen oxidizes chloroform into a poisonous gas called phosgene. Hence, chloroform is stored in dark-coloured bottles filled up to the brim.
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- Chloroform undergoes oxidation in presence of light and air. Therefore, it is stored in dark coloured bottles, which are filled upto the brim.1% ethanol retards the oxidation and converts the phosgene formed into harmless ethyl carbonate.
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