JEE Main 2016 Chemistry question

Not in JEE Main or NEET syllabus

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

(1)Sulphur dioxide
(2)Carbon dioxideCorrect
(3)Nitrogen dioxide
(4)Tetrachloroethylene

Answer: (2)

Solution

Traditional dry cleaning used **tetrachloroethylene**, which is a suspected carcinogen and contaminates groundwater, so replacing it is the whole point of the question — option (4) is the problem, not the solution. The green alternative is **liquefied carbon dioxide** together with a suitable surfactant: it dissolves

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Question ID VK-115626