MCQ PracticeWhen the concentration of SO 2 in air is greater than __________ ppm, it gives a pungent smell.Subject: Chemical EngineeringTopic: Environmental Engineering In CeA0.01B0.1C1D4Correct Answer: DPractice QuizBack to MCQsRelated MCQsCurrent flows in a circuit whenEighttenths coulomb passes a point in 4 s. The current in amperes isThe unit of electrical charge is the