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Describe the laboratory preparation of oxygen gas from hydrogen peroxide with a neat diagrem. |
Answer» SOLUTION : <br> `Principle: Hydrogen peroxide in the presence of a catalyst, that is manganese dioxide `(MnO_(2))` undergoes decomposition to give water and oxygen at room temperature. <br> `2H_(2)O_(2)overset(MnO_(2))(to)2H_(2)O+O_(2)` <br> Experiment: `MnO_(2)` is taken in a clean and dry conical flask. `H_(2)O_(2)` solution is added drop wise through the hiistle funnel which is fitted to conical flask with the help of a rubber stopper. <br> Observation: The oxygen gas evolved passes through a delivery tube into the beehive shelf placed in a trough of water. The oxygen gas evolves with effervescenve in the gas cylinder inverted over the beehive shelf. The gas evolved rekindles a glowing splinter. <br> Method of collection of oxygen gas: `O_(2)` gas evolved is collected by downward displacement of water. <br> Precautions: (a) heating of reaction mixture should be avoided. <br> (b) `MnO_(2)` used should be devoid of impurities.)
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