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	LESSON 50A: Discovery of Hydrogen @a1inchemistry41 (A1 IN CHEMISTRY) View
	LESSON 53A: Forms and Uses of hydrogen (A1 IN CHEMISTRY) View
	LESSON 51B: Industrial preparation (Manufacture) of hydrogen gas (A1 IN CHEMISTRY) View
	LESSON 51A: Properties of Hydrogen (A1 IN CHEMISTRY) View
	LESSON 53B: Discovery and properties of Oxygen (A1 IN CHEMISTRY) View
	LESSON 50B: Method of Gas Collection (A1 IN CHEMISTRY) View
	LESSON 57A: TRENDS IN THE HALOGEN GROUP (A1 IN CHEMISTRY) View
	LESSON 55A: Types of Oxides (A1 IN CHEMISTRY) View
	LESSON 54B: Chemical Properties of Oxygen (A1 IN CHEMISTRY) View
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