Acid rain is specified when pH is
A. below 7
B. below 5.6
C. above 7
D. above 9
Answer: Option B
A. below 7
B. below 5.6
C. above 7
D. above 9
Answer: Option B
The term 'brown air' is used for
A. Acid fumes
B. Photochemical smog
C. Sulphurous smog
D. Industrial smog
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