Question

Dry $HCl$ gas changes the colour of the litmus paper.

• A. True
• B. False

Answer 1

The correct option is B

False

Dry $\text{HCl}$ gas doesn’t change the colour of the dry litmus paper because hydrogen ions in HCl are produced in the presence of water. The separation of $H^{+}$ ions) ion from $\text{HCl}$ molecules cannot occur in the absence of water. Hence, acids produce $H^{+}$ions only in the presence of water. So, in the absence of water, a substance will not form hydrogen ions and hence will not show its acidic behaviour.