In the redox reaction how can you test for the decreased gas in the laboratory?

One way to test for the presence of a gas in a redox reaction in the laboratory is to use a gas collection apparatus. This apparatus typically consists of a reaction vessel connected to a gas collection tube filled with water. As the gas is produced in the reaction, it displaces the water in the tube and collects at the top.

To test for the presence of the gas, you can perform the following steps:

1. Set up the gas collection apparatus and ensure that it is properly sealed.
2. Start the redox reaction and allow the gas to be produced.
3. Observe the level of water in the gas collection tube. If the gas is being produced, the water level will decrease as the gas displaces it.
4. After the reaction is complete, carefully remove the gas collection tube from the apparatus.
5. Hold a lit match or a glowing splint at the opening of the gas collection tube. If the gas is flammable, it will ignite and produce a flame.
6. Alternatively, you can bubble the gas through a solution that will react with it in a characteristic way, producing a color change or a precipitate.

By performing these tests, you can confirm the presence of the gas produced in the redox reaction.