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a
The use of CCl2=CCl2 in dry cleaning has been stopped because it is carcinogenic and harmful for ground water
b
In dry cleaning liquid CO2 liquid has replaced halogenated solvents
c
In dry cleaning H2O2 is used as bleaching agent
d
All of the above
answer is D.
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Detailed Solution
The use of CCl2=CCl2 in dry cleaning has been stopped, in dry cleaning H2O2 is used as bleaching agent and in dry cleaning liquid CO2 liquid has replaced halogenated solvents.