Question

Out of the following options, which two gases change the colour of damp red litmus paper?

• A. Ammonia and Chlorine
• B. Ammonia and Hydrogen Chloride
• C. Carbon Dioxide and Chlorine
• D. Carbon Dioxide and Sulphur Dioxide

Answer 1

The correct option is A

Ammonia and Chlorine

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