MCQ PracticeThe main type of sludge gas evolved during sewage treatment in Imhoff tank isSubject: Chemical EngineeringTopic: Environmental Engineering In CeACO 2BCH 4CCODH 2Correct Answer: BPractice 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