Chemistry
Identify the gas evolved in the figure shown below.
What would happen if the following changes are made:
(a) In place of zinc granules, same amount of zinc dust is taken in the test tube.
(b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.
(c) Sodium hydroxide is taken in place of dilute sulphuric acid and it is heated.
Hydrogen
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Answer
Gas evolved is Hydrogen.
(a) The reaction and the evolution of hydrogen gas will proceed more quickly if the same quantity of zinc dust is placed in the test tube. This is because the surface area of zinc dust is greater than that of zinc granules.
(b) When dilute hydrochloric acid is used in place of sulphuric acid, same amount of gas will evolve.
Zn + 2HCl (dil.) ⟶ ZnCl2 + H2 ↑
(c) Zinc reacts with hot concentrated alkalis like sodium hydroxide to form hydrogen and a soluble salt.
Zn + 2NaOH ⟶ Na2ZnO2 + H2 ↑
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