Precautions in laboratory preparation of hydrogen.
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Dangerous heat and chemical reaction may result from incorrect operation of hydrogen generators. Removing a hydrogen generator from a water tank while in operation will produce excessive heat and may cause a dangerous chemical reaction. Never remove a generator from the water while in operation until the generation of hydrogen gas has stopped.
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Answer:
(1) The parameters should be air tight.
(2) No flame should be brought near the Apparatus
(3) the gas is collected only after all the air in the Apparatus has escaped
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