Which gas is liberated when dilute hydrochloric acid reacts with zinc metal? Write a balanced chemical equation for the reaction which takes place. How will you test this gas? Name a metal which produces the same gas just by reacting with cold water.

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Solution

When dilute hydrochloric acid reacts with zinc metal, zinc will displace hydrogen from hydrochloric acid and form zinc chloride. It is accompanied by the release of hydrogen gas.

$2 Zn (s) + 2 HCl (aq) \to {ZnCl}_{2} (aq) + H_{2} (g)$

When we place a burning candle near the mouth of the test tube a pop-up sound is produced which confirms the presence of hydrogen gas in solution.
Sodium metal on reaction with cold water gives sodium hydroxide and hydrogen gas will evolve.

$2 Na + 2 H_{2} O \to 2 NaOH + H_{2}$

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Similar questions

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved.

(b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?

H_{2} S O_{4}

How will you test for the gas which is liberated when hydrochloric acid reacts with an active metals?

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