Question

How do you recognize the gas that evolves in the experiment

Answer 1

A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide.[1][2] Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.

Answer 2

Explanation:

by keeping flame we can identify the gas which evolved in an expirement

for example if the flame is put off then released gas is CO2 And if the flame burns more efficiently then the the released gas is O2

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