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Q. Dry ice is the solid form of :
Dry ice, carbon dioxide in its solid form, a dense, snow like substance that sublimes (passes directly into the vapour without melting) at −78.5 °C (−109.3 °F), used as a refrigerant, especially during shipping of perishable products such as meats or ice cream.
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Q. For purifying drinking water alum is used
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