265Chemical EngineeringMediumA gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ________ ppm?A6000 to 9000B10000 to 100000C3000 to 6000D1000 to 2000 Correct answerB. 10000 to 100000 ExplanationThe correct answer is 10000 to 100000.