Describe the laboratory method of preparation of hydrogen gas.

1.	Describe the laboratory method of preparation of hydrogen gas.
Answer» Solution :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. Thena colourless, and odourless gas evolves. Collection of gas: Hydrogen is collected by the downward DISPLACEMENT of water.

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