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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


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.

Science
Lakhmir Chemistry (2020, 2021)
All

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