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When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?
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When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?
A. 0.01
B. 0.1
C. 1
D. 4
Correct Answer:
4
✔
Last Updated:
March 11, 2019