Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about ______________ ppm?
Correct answer: A. < 1
- A. < 1
- B. 10-100
- C. 100-200
- D. 100-1000
Explanation
Phosgene is extremely toxic, with a permissible exposure limit well below 1 ppm, commonly quoted near 0.1 ppm. Therefore, the range below 1 ppm is appropriate.
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