Ncert Exercises & Solutions

For dry cleaning, in the place of tetrachloroethane, liquified 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 liquified carbon dioxide with detergent be completely safe from the point of view of pollution? Explain.

Tetrachloroethan,

{Cl}_{2} CH - {CHI}_{2}

is suspected to be carcinogenic and also contaminates the ground water. The harmful effect will be prevented by using liquified CO₂ along with suitable detergent.

Use of liquified CO₂ along with detergent will not completely be safe because most of the detergents are non-biodegradable and they cause water pollution. Moreover, liquified CO₂ will ultimately enter into the atmosphere and contribute to the green house effect.

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