Question

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

• A. Sulphur dioxide
• B. Carbon dioxide
• C. Nitrogen dioxide
• D. Tetrachloroethylene

Answer 1

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.