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Question

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

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Solution

When zinc reacted with dilute hydrochloric acid, it gives zinc chloride and hydrogen gas is evolved, hydrogen gas is colourless and odourless gas which evolves with bubbles.
Zn(s)+2HCl(aq)ZnCl2(aq)+H2(g)

Hence, the correct answer is option 4.

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