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Question 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?
Hydrogen gas is released when an acid reacts with a metal along with formation of salt.
Metal + Acid ⟶ Salt + Hydrogen gas ↑
For example : When sodium hydroxide is reacted with Zn, salt of sodium zincate is formed along with hydrogen gas.
2NaOH(aq) + Zn(s) ⟶ Na2ZnO2(s) + H2(g)
In order to test the presence of hydrogen gas, a burning candle is bought near hydrogen gas, the gas burns with a pop sound.