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UPSC Prelims GS - 2023
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Section-1
Score(+ 2
, -0.66
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Question 30
DIFFICULT
Correct: +2
Incorrect: -2
Consider the following:
1. Aerosols
2. Foam agents
3. Fire retardants
4. LubricantsIn the making of
how many of the above are hydrofluorocarbons used?
a
Only one
b
Only two
c
Only three
d
All four