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Question

If vapours of dry ammonia gas are brought into contact with red litmus paper, what will happen to the colour of the litmus paper?

A
Litmus paper turns pink
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B
Litmus paper turns yellow
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C
No change in the litmus paper
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D
Litmus paper turns blue
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Solution

The correct option is C No change in the litmus paper
The colour of the litmus paper will remain unchanged because ammonia (NH3) gas does not show basic character in the absence of water.

In the presence of water, ammonia gets converted to ammonium (NH+4) ion, which turns red litmus to blue as it is a basic solution.

NH3(aq)+H2O(l)NH+4(aq)+OH(aq)

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