alleryOzone becomes uncomfortable to breathe above about:
A50 ppm
B100 ppm
C500 ppm
D900 ppm
Answer & Solution
Correct answer: B. 100 ppm
1. In small concentrations ozone is harmless.
2. Beyond a certain level it causes headache and nausea.
3. That level is about 100 parts per million.
_Source: syllabus Chemistry, Chapter 7, The p-Block Elements._
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