When dilute sulphuric acid is added to granulated zinc placed in a test-tube, the observation made is :(1) the surface of the metal turns shiny(2) the reaction mixture turns milky(3) odour of sulphur dioxide is observed(4) a colourless and odourless gas evolves with bubbles

Correct Answer: (4) 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.

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

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Updated on: 10-Oct-2022

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