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How will you prepare dihydrogen from the...

How will you prepare dihydrogen from the metals ?

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Dihydrogen can be prepared from metals in the laboratory as given below:
i) By reaction of granulated zinc with dilute hydrochloric acid.
`Zn + 2HCl to ZnCl_2 + H_2`
ii) By reaction of zinc with aqueous alkali.
`Zn + 2NaOH overset("heat")(to) Na_2ZnO_2 + H_2`
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