Question 3219 Deck General

The correct answer is D) 1000 ppm. The minimum concentration of H2S that can cause death if a person is exposed for even an instant is 1000 ppm. This is based on the fact that exposure to concentrations of H2S above 1000 ppm can be immediately fatal. Concentrations below 1000 ppm, while still highly toxic, may allow for some time before death occurs, depending on the duration and level of exposure. The other answer choices are incorrect because 200 ppm, 400 ppm, and 600 ppm, while dangerously high levels of H2S, are not the minimum concentration that can cause instant death.