Question

give reasons for why granulated zinc is preferred in lab preparation of hydrogen
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Answer 1

The granulated Zn is preferred to metallic Zn in the preparation of hydrogen because granulated zinc has more surface area exposed to the acid, so the reaction can occur more rapi

Answer 2

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granulated zinc is therefore preferred . it contains traces of copper as an impurity witch catalyses the reaction and prevents the deposition of the gas on zinc
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In preparation of hydrogen by reaction with HCl, granulated zinc is preferred instead of blocks of zinc because,
zinc blocks are non-porous. Due to this reaction will be very slow. Hence it is preferred to use zinc granules.
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