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Q.

What happens when a moist blue litmus paper is brought near the hydrochloric acid gas?

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a

The colour of litmus paper vanishes out

b

Litmus paper turns green

c

No change in the colour of the litmus paper

d

Litmus paper turns red

answer is A.

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Detailed Solution

Hydrogen Chloride gas reacts with water vapours present on blue litmus paper and form H+ ions. The presence of H+ ions changes blue litmus to red.

Therefore, moist blue litmus paper turns red when placed is brought near the hydrochloric acid gas.

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