An aqueous solution turns red litmus solution blue

• GC Acids Bases Salts

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

1. Baking powder
2. Lime
3. Ammonium hydroxide solution
4. Hydrochloric acid

Answer

Alkaline solutions turn red litmus paper to blue. Excess of acid will reverse the changes so we have to add excess of hydrochloric acid which turns the solution acidic.

The correct option is D.