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Question
(a) What happens when an acid reacts with a metal? Give chemical equation of the reaction involved.
(b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?
(b) Which gas is usually liberated when an acid reacts with a metal? How will you test for the presence of this gas?
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Solution
(a) When a metal is treated with an acid, it liberates hydrogen gas from the acid and combines with the remaining part of the acid to form a compound called a salt.
Chemical equation:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
(b) Hydrogen gas is usually liberated when an acid reacts with an active metal.
For testing the presence of hydrogen gas, bring a burning candle near the test tube in which reaction has taken place. If the gas burns with a popping sound, the gas is hydrogen.
Chemical equation:
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
(b) Hydrogen gas is usually liberated when an acid reacts with an active metal.
For testing the presence of hydrogen gas, bring a burning candle near the test tube in which reaction has taken place. If the gas burns with a popping sound, the gas is hydrogen.
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