Source: Exemplar
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.
Model Answer
Dry HCl gas: Turns blue litmus red Moistened NH₃ gas: Turns red litmus blue Lemon juice: Turns blue litmus red Carbonated soft drink: Turns blue litmus red Curd: Turns blue litmus red Soap solution: Turns red litmus blue