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Q.

For dry cleaning of clothes instead of tetrachloroethene, which is carcinogenic in nature, which of the following solvents can be used ?

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a

$Liquid {CO}_{2}$

b

$Liquid O_{3}$

c

$H_{2} O_{2}$

d

$Petrol$

answer is A.

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Detailed Solution

Now–a–days, ${CCl}_{2} = {CCl}_{2}$ (tetrachloroethene), which is a suspected carcinogen is replaced by a better solvent like liquid ${CO}_{2}$ with suitable detergent in dry cleaning.
Replacement of halogenated solvent by liquid CO₂ will result in less harm to ground water.

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