Question

Which gas is usually liberated when an acid reacts with a metal ? Illustrate with an example. How will you test for the presence of this gas ?

Give Explanation!!​

Answer 1

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Which gas is usually liberated when an acid reacts with a metal ? Illustrate with an example. How will you test for the presence of this gas ?

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(i) Hydrogen (H2) gas is liberated when an acid reacts with a metal.

(ii) Illustration : Set up the apparatus as shown in the given figure. Take some zinc granules in the test tube. Add about 5 mL dilute hydrochloric acid slowly. Soon the reaction between zinc and hydrochloric acid starts and hydrogen gas is evolved.

(iii) Test for H2 gas :

H2 gas is not soluble in water. When passed through soap solution, it gets trapped into bubbles.

Bring a burning candle near the soap bubble filled with gas. The soap bubble bursts and hydrogen gas burns with a pop sound.

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Answer 2

Answer:

Hydrogen gas is liberated when an acid reacts with a metal. For example, when zinc metal reacts with dil. hydrogen is evolved and salt zinc chloride is formed as: It can be tested by bringing a burning candle near the gas.