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Question

Which two gases each change the colour of damp red litmus paper? 


  1. Ammonia and Hydrogen Chloride

  2. Ammonia and Chlorine

  3. Carbon Dioxide and Sulphur Dioxide

  4. Carbon Dioxide and Chlorine 


Solution

The correct option is B

Ammonia and Chlorine


Ammonia being alkaline turns damp red litmus blue. Chlorine on the other hand bleaches damp red litmus paper to white.

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