Acid and base in a water solution — task. Chemistry CBSE Live product, Class 10 (2026-27).

Answer the following questions briefly:

Anitha wants to study the acidic and basic nature of substances and set up an experiment as shown below.

i. Why is moist litmus paper used instead of dry litmus paper to test HCl gas?

Moisture allows \(HCl\) gas to dissociate into \(OH^-\) ions, which show basic properties
Moisture allows \(HCl\) gas to dissociate into \(H^+\) ions, which show acidic properties
Moisture allows \(HCl\) gas to dissociate into \(H^+\) ions, which show basic properties
Moisture allows \(HCl\) gas to dissociate into \(OH^-\) ions, which show acidic properties

ii. Why is a guard tube containing calcium chloride used in the experiment?

Did you find an error?

8. Acid and base in a water solution