The air pollutant unknown in nature is
A. NO
B. CO
C. HCHO
D. DDT
Correct answer is option C.HCHO. Explanation: The air pollutant unknown in nature is HCHO.
The air pollutant unknown in nature is
A. NO
B. CO
C. HCHO
D. DDT
Correct answer is option C.HCHO. Explanation: The air pollutant unknown in nature is HCHO.
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