What will be the action of the following substances on litmus paper? Dry HCl gas, Moistened NH3 gas, Lemon juice, Carbonated soft drink, Curd, Soap solution.

Soln:

Dry HCl gas- No effect

Moistened NH3 gas- Turns litmus paper to blue colour Lemon juice- Turns litmus paper to red colour Carbonated soft drink- Turns litmus paper to red colour Curd- Turns litmus paper to red colour

Soap solution- Turns litmus paper to blue colour