Respuesta :

notriannelol

Explanation:

Pure zinc is not used for preparation of hydrogen gas because it is non-porous. As a result, the reaction carried out with pure zinc would be too slow. Hence, impurities like copper is often added to the zinc. Copper acts as a catalyst and increases the speed of the reaction.

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Pure zinc is not used for the preparation of hydrogen gas because it is non-porous. As a result, the reaction carried out with pure zinc would be too slow. Hence impurities like copper is often added to the zinc. Copper acts as a catalyst ( by providing a large surface area ) and increases the speed of the reaction.

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