Question 279 Deck General

The correct answer is D) Phosphine. The placard number 2199 corresponds to the United Nations (UN) identification number for phosphine, which is a flammable, toxic gas used as a fumigant and in the production of other chemicals. According to the Hazardous Materials Table in the Code of Federal Regulations (49 CFR 172.101), the placard number 2199 is assigned to phosphine. The other answer choices (A, B, and C) do not match the placard number 2199 and therefore are incorrect. Adiponitrile, xylenol, and furan have different UN identification numbers that would be displayed on the placard.