When treated with dilute hydrochloric acid, which of the following gives a gas which does not turn lime water milky?
(1) sodium sulphate
(2) sodium carbonate
(3) copper metal
(4) zinc metal

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Solution

When hydrochloric acid is treated with zinc metal then zinc chloride form and hydrogen gas evolve.
$Zn (s) + HCl (g) \to {ZnCl}_{2} (s) + H_{2} (g)$
Hydrogen gas doesn't turn lime water milky, as there is no carbonate formation in the solution.

Hence, the correct answer is option 4.

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Q. When a metal carbonate is treated with dilute hydrochloric acid, the gas liberated is:

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When treated with dilute hydrochloric acid, which of the following gives a gas which does not turn lime water milky? (1) sodium sulphate (2) sodium carbonate (3) copper metal (4) zinc metal

When hydrochloric acid is treated with zinc metal then zinc chloride form and hydrogen gas evolve. Zn(s)+HCl(g)→ZnCl2(s)+H2(g) Hydrogen gas doesn't turn lime water milky, as there is no carbonate formation in the solution. Hence, the correct answer is option 4.

When treated with dilute hydrochloric acid, which of the following gives a gas which does not turn lime water milky?
(1) sodium sulphate
(2) sodium carbonate
(3) copper metal
(4) zinc metal

When hydrochloric acid is treated with zinc metal then zinc chloride form and hydrogen gas evolve.
$Zn (s) + HCl (g) \to {ZnCl}_{2} (s) + H_{2} (g)$
Hydrogen gas doesn't turn lime water milky, as there is no carbonate formation in the solution.

Hence, the correct answer is option 4.