When dilute hydro-chloric acid is added to granulated zinc placed in a test tube, the observation made is
(1) the surface of the metal turns shining
(2) the reaction mixture turns milky
(3) odour of chlorine is observed
(4) a colourless and odorless gas evolves with bubbles

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Solution

When dilute hydrochloric acid is added to granulated zinc, colorless and odorless hydrogen gas is evolved with bubbles.
$2 HCl (l) + Zn (s) \to ZnCl {}_{2}(aq) + H_{2} (g)$

Hence, the correct answer is option 4.

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When dilute hydro-chloric acid is added to granulated zinc placed in a test tube, the observation made is (1) the surface of the metal turns shining (2) the reaction mixture turns milky (3) odour of chlorine is observed (4) a colourless and odorless gas evolves with bubbles

When dilute hydrochloric acid is added to granulated zinc, colorless and odorless hydrogen gas is evolved with bubbles. 2HCl(l)+Zn(s)→ZnCl(2aq)+H2(g) Hence, the correct answer is option 4.

When dilute hydro-chloric acid is added to granulated zinc placed in a test tube, the observation made is
(1) the surface of the metal turns shining
(2) the reaction mixture turns milky
(3) odour of chlorine is observed
(4) a colourless and odorless gas evolves with bubbles

When dilute hydrochloric acid is added to granulated zinc, colorless and odorless hydrogen gas is evolved with bubbles.
$2 HCl (l) + Zn (s) \to ZnCl {}_{2}(aq) + H_{2} (g)$

Hence, the correct answer is option 4.