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What is the evolution of gas?
Evolution of gas occurs during a double displacement reaction where one of the products is a gas.
For example, carbonic acid breaks down to water and carbon dioxide
H2CO3 ---> H2O + CO2
sulfurous acid breaks down to water and sulfur dioxide
H2SO3 --> H2O + SO2
ammonium hydroxide breaks down to water and ammonia gas.
NH4OH --> NH3+ H2O
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