how can you show that during a chemical reaction gas is evolved
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A gas evolution reaction is a chemical process that produces a gas, such as oxygen or carbon dioxide.
Acids react with carbonates to produce a salt, carbon dioxide, and water.
Limewater can be used to detect the presence of carbon dioxide evolved in a reaction.
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In a chemical reaction, the gas is evolved as product. Most of the gas evolution reactions can be carried out in fume chamber. some chemical reactions are characterized by change in color. Citric acid reacts with potassium permanganate, then the purple colour disappears
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