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Describe the laboratory method of prepar...

Describe the laboratory method of preparation of hydrogen gas.

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Laboratory method of preparation
Principle: All the metals present above hydrogen in the reactivity series on reaction with dilute HCI or dilute `H_(2)SO_(4)` liberate hydrogen gas. Zinc metal is preferred for this reaction.
`Zn+2HCItoZnCI_(2)+H_(2)uarr`
`Zn+H_(2)SO_(4)toZnSO_(4)+H_(4)uarr`

Experiment : Some granulated zinc pieces are taken in a flat-bottom flask bottom flask fitted with a two holed air tigth cork. In one hole, a thistle a thistle funnel is inerted and in anoter hole, a long dilivery tube is inseted. Dilute `H_(2)SO_(4)` is added to the flask drop-wise through the thistile funnel.
Observation: Effervescence is observed in the initial stages of the reaction. Then a colourless, and odourless gas evolves.
Collection of gas: Hydrogen is collected by the downward displacement of water.
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