Q6 of 18 Page 90

Dry hydrogen chloride gas does not turn blue litmus to red whereas hydrochloric acid does. Why? (AS1)

An acid is a substance which has the ability to give H+ ion.

Dry hydrogen chloride gas is not an acid and has no ability to give hydrogen ions. Thus, it does not turn blue litmus to red.


Hydrochloric acid is an acid and has the ability to give Hydrogen ions. Thus, it turns blue litmus to red.


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