Std-10; Ch-02; Acids, Bases and Salts; Pg-22;
Intext Question-2:
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?
Answer:
Hydrogen gas is usually liberated when an acid reacts with a metal.
Take few pieces of zinc granules and add 5 ml of dilute H2SO4. Shake it and pass the gas produced into a soap solution. The bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas.
We can test the evolved hydrogen gas by its burning with a pop sound when a candle is brought near the soap bubbles.
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