Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.
(a) The surface of metal becomes shining
(b) The reaction mixture turns milky
(c) Odour of a pungent-smelling gas is recorded
(d) A colourless and odourless gas is evolved.

Correct Answer: (d) a colourless and odourless gas evolves with bubbles
Explanation: When zinc reacts with dilute hydrochloric acid, it produces zinc chloride and hydrogen gas is evolved. Hydrogen gas is colourless and odourless gas which evolves with bubbles.

$Zn (s) + 2HCl (aq) → ZnCl_2 (aq) + H_2 (g)$

Updated on: 14-Mar-2023

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