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a
Chlorothane used as solvent for dry cleaning contaminates ground water
b
Liquid CO2 with suitable reagent will contaminate ground water to less extent
c
Cl2 used for bleaching is less harmful than H2O2
d
H2O2 used for bleaching clothes gives better result and uses less amount of H2O
answer is C.
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Detailed Solution
Hydrogen peroxide (H2O2) is used for the purpose of bleaching clothes in the process of laundry, which gives better results and makes use of lesser amount of water Hence H2O2 is less harm full than Cl2 for bleaching clothes.