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Question
Give a chemical test to distinguish between the following gases:
Sulphur dioxide and chlorine.
Solution
Sulphur dioxide [SO2]:
- Moist blue litmus paper turns red.
- turns acidified potassium permanganate from pink to colourless.
Chlorine [Cl2]:
- Moist blue paper turns red and gets bleached
- Turns moist starch iodide paper blue-black
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