For the laboratory preparation of hydrogen, give a fully labelled diagram.

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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.
As shown in the diagram

Reactants used in this procedure: Granulated zinc, and dilute sulphuric acid.
Reaction : $Zn (s) + H_{2} {SO}_{4} (aq .) \to {ZnSO}_{4} (aq .) + H_{2} (g) zincc sulphuric aicd zinc sulphate hydrogen$

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