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Write one method each for the laboratory preparation of dihydrogen from 

(i) mineral acid 

(ii) aqueous alkali.

1. Which is the catalyst used for the reaction?

 2. Which is the product in this reaction?

1 Answer

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1.By the reaction of granulated zinc with dilute HCl. 

Zn + 2HCl → ZnCl2 + H2 

2. By the reaction of zinc with aqueous alkali.

 Zn + 2NaOH → Na2ZnO2 + H2

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