Question

Litmus Paper do not change its colour when it is treated with dry gas of hydrochloric acid why​

Answer 1

Answer:

It is because litmus paper only changes its colour when dipped in a liquid or solution.

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Answer 2

Answer:

because water is required for the formation of hydronium ions which is responsible for the colour change of litmus paper .since there no water in this case ,the formation of hydronium ions won't take place and no colour change would be observed.