Question

which gad is usually liberated when acid reacts with metal ? Illustrate with an example ...How will u test the presence of this gas?

Answer 1

hydrogen gas is liberated when metals react with acid.

EXAMPLE : HCl +Na---------> NaCl +H2

if we put a flame over this gas then a popping sound is heard, which confirms the presence of hydrogen gas.

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Answer 2

Answer:

BTS

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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.