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

Options

A. Baking powder
B. Lime
C. Amonium hydroxide solution
D. Hydrochloric acid

Answer

D

Explanation

Since, the aqueous solution turns red litmus solution blue. So it is a basic compund An acid solution (HCI) would reverse the change .That is HCI would turn blue litmius solution to red.
Other options baking powder, lime and ammonium hydroxide solution are basic compunds . So the blue litmus solution would not change the colour by adding these compounds.