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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?
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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

When an acid reacts with a metal it produces salt and liberate hydrogen gas. To test the presence of hydrogen gas, take a burning candle near the mouth of the reacting vessel. For example, when calcium metal \((Ca)\) reacts with sulphuric acid \((H_2SO_4)\), then the salt \((CaSO_4)\) is formed along with the liberation of hydrogen \((H_2)\) gas.
\(Ca + H_{2}SO_{4} → CaSO_{4} + H_{2}\)
Test - As hydrogen is a combustible gas, the burning candle continues to burn with a pop sound.
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