MCQ PracticeWhich of the following is not a method of preparing oxygen?Subject: ChemistryTopic: ChemistryAElectrolysis of waterBFractional distillation of liquid airCDecomposition of potassium permanganateDDecomposition of manganese dioxideCorrect 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