Question

In an experiment, a test-tube full of chlorine water was inverted in chlorine water as shown in the diagram below and the set up left in sunlight for one day.

After one day, a gas was found to have collected in the test-tube

1. Identify the gas 
2. How can the above gas be tested? 

Answer 1

1. Oxygen
2.    
   • Introduce a glowing splint into the gas 
   • It will relight