Civil Engineering MCQAE Level Civil Engineering
NO2 concentration in air is 470 microgram/m^3 at 25°C. The concentration in ppm is
Environmental EngineeringEnvironmental EngineeringMEDIUM
Choose the correct answer
A
25 ppm
B
2.5 ppm
C
0.25 ppm
D
0.4 ppm
Correct Answer
C. 0.25 ppm
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ppm = (mg/m^3 x 24.45)/molecular weight = 0.470 x 24.45/46 ≈ 0.25 ppm
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.