labrotary preparation of oxygen
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To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.
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oxygen has is prepared in the laboratory by hydrogen peroxide and manganese dioxide . in this reaction manganese dioxide is used as catalysts. the production of oxygen gas is collected in the gas jar by downward displacement of water
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