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ICSE Class 8 Chemistry Question 1 of 18

Hydrogen — Question 6

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Question

Question 6

(a) Name the chemicals required to prepare hydrogen gas in the laboratory.

(b) Give a balanced chemical equation for the reaction.

(c) Draw a neat and well-labelled diagram for the laboratory preparation of hydrogen.

(d) How is hydrogen gas collected? Why?

Answer

(a) Granulated zinc and dilute hydrochloric acid are the chemicals required to prepare hydrogen gas in the laboratory.

(b) Zn + 2HCl ⟶ ZnCl2 + H2 (g)

(c) Below diagram shows the laboratory preparation of Hydrogen gas:

Draw a neat and well-labelled diagram for the laboratory preparation of hydrogen. Hydrogen, Concise Chemistry Solutions ICSE Class 8.

(d) Hydrogen gas is collected by downward displacement of water as it is sparingly soluble in water. Though hydrogen gas is lighter than air, it is not collected by downward displacement of air as a mixture of hydrogen and air can lead to an explosion.