Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
Correct answer: D. Moderately
- A. Highly
- B. Very extremely
- C. Extremely
- D. Moderately
Explanation
A permissible concentration of 100 to 1000 ppm is conventionally classified as a moderately toxic gas range. Highly toxic gases have much lower allowable limits because small concentrations can cause serious harm.
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