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 Why Pure Zinc is not used to prepare hydrogen

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.

@ Ajith, very good effort, keep it up !!!! 

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Instead of pure zinc, impure zinc i.e. with copper as the impurity is used to produce hydrogwn because copper acts as a positive catalyst and therefore increases the rate of speed of the reaction. And pure zinc is not used becauseit will make the proces very slow.

Hope it helps.

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because pure zinc will react with hudrogen so impure zinc is used with some impuities such as copper which will act as a positive catalyst and increases the rate of reaction.

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Granulated zinc is preferred over pure zinc because it contains impurities like copper which catalyst the reaction and prevants the decomposition of gas over it.

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