For dry cleaning, in the place of tetrachloroethane, liquefied carbon dioxide with suitable detergent is an alternative solvent. What type of harm to the environment will be prevented by stopping use of tetrachloroethane? Will use of liquefied carbon dioxide with detergent be completely safe from the point of view of pollution? Explain.

Answers (1)

Tetrachloroethene was used as a solvent for cleaning; it contaminates groundwater and is suspected to be a carcinogen. It is now replaced with liquified CO_2 since it will be less harmful to the groundwater. Nowadays, H_{2}O_{2} is used for bleaching, which gives better results and requires a lesser amount of water.

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