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Impure granulated zinc is preferred to p...

Impure granulated zinc is preferred to pure zinc for the preparation of hydrogen . How do you account for this ?

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(i) the mode of reaction between zinc and acid
(ii) role of Zn
(iii) change in property of Zn in granulated and pure forms.
(iv) comparison of the reactivity of hydrogen in presence of granulated zinc and pure zinc
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