Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?

Sulphur dioxide

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Carbon dioxide

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Nitrogen dioxide

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Tetrachloroethylene

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Solution

The correct option is B Carbon dioxide
Liquid carbon dioxide is better to replace conventional halogenated solvents which are potentially carcinogenic. These detergents are developed in a way that one end of the molecule is soluble in non-polar substances like grease, oil stains and the other end dissolves in liquid carbon dioxide.

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Which of the following is used in dry cleaning of clothes?

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