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.
2H2SO4 + Zn → Zn(SO4)2 + 2H2↑
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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