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Question

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

A

Ammonia and Chlorine

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B

Ammonia and Hydrogen Chloride

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C

Carbon Dioxide and Chlorine

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D

Carbon Dioxide and Sulphur Dioxide

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Solution

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.


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