Q
Photochemical smog is formed from automobile exhaust ________________?
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A
A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
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B
B. Appears only on sunny days
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C
C. Is harmful for crops and trees also besides causing eye irritation & asthma
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D
D. All a., b. & c.
Correct Answer:
D. D. All a., b. & c.