Question

preparation of Hydrogen in laboratory

Answer 1

Preparation of Hydrogen

Hydrogen gas is prepared in the laboratory by the action of dilute hydrochloric acid or dilute sulphuric acid on granulated zinc.

Zn + 2HCL → ZnCL₂ + H₂↑
Zn + H2SO₄ → ZnSO₄ + H₂↑

Granulated zinc is commercial zinc obtained from molten zinc. It contains impurities like copper which have a slight catalytic effect on the reaction and speeds up the reaction.

Answer 2

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i) Four metals are usually preferred to prepare hydrogen from water, they are Magnesium,Aluminium,Zinc and Iron. in case of magnesium it has to be reacted with boiling water to give hydrogen and in case of aluminium, zinc, and iron they have to be reacted with steam to give hydrogen.The reaction of iron and steam is reversible.

ii) The same metals Magnesium, Aluminium, Zinc and Iron are also preferred to produce hydrogen from dilute acids.

Even though Lead is above hydrogen in the reactivity series it is not preferred to produce hydrogen with dil.acids as the solution of lead and the dil.acid forms an insoluble coating on the solution and stops the reaction.

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