For the laboratory preparation of hydrogen, give the chemical equation.

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Solution

To prepare hydrogen gas in the laboratory following procedure is followed.
Procedure: Place a few pieces of granulated zinc in a flat-bottomed flask fitted with an air-tight cork having two holes. Through one hole pass a thistle funnel having a long stem, and through the other, a delivery tube. Pour dilute sulphuric acid through the thistle funnel.
A brisk reaction takes place and hydrogen is produced with effervescence. When all the air from the apparatus has been expelled, collect the gas.

Reactants used in this procedure: Granulated zinc, dilute sulphuric acid.
Reaction : $Zn (s) + H_{2} {SO}_{4} (aq .) \to {ZnSO}_{4} (aq .) + H_{2} (g)$
A brisk reaction takes place and hydrogen is produced with effervescence. When all the air from the apparatus has been expelled, collect the gas.

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