demonstrate the laboratory preparation of hydrogen gas
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hydrogen is usually prepared by the reaction of granulated Zinc with dilute hydrochloric acid.
it can also be prepared by the reaction of Zinc with aqueous alkali.
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1)Hydrogen is prepared by the reaction of zinc with hydrochloric acid
Zn+2HCl---->Zn^2+ + H2
2) Reaction of Zinc with aqueous alkali
Zn +2NaOH----->Na2ZnO2+H2
Sodium zincate
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