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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.
ChemF2midt1q8
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? 

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

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