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Question
Which gas is liberated when a dilute acid reacts with a metal carbonate? How will you test for the presence of this gas?
Short Answer
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Solution
When a dilute acid reacts with a metal carbonate, carbon dioxide (CO2) gas is liberated.
Test for CO2: Pass the gas through limewater. The limewater turns milky due to the formation of calcium carbonate.
\[\ce{Ca(OH)2 + CO2 -> CaCO3 ↓ + H2O}\]
Thus, the gas is carbon dioxide.
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