Question

Pure Zinc is not used in the laboratory preparation of hydrogen.

Answer 1

Answer:

because impure zinc or zinc granules contains impurities which serve as positive catalyst And speeds the chemical reaction

Explanation:

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Answer 2

HERE IS YOUR ANSWER

Pure zinc is not used in laboratory preparation of hydrogen because it is non-porous in nature. As a result reaction would occur very slowly. Hence impurities like copper is added to the zinc which increases the speed of the reaction.

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