Answer :

The aqueous solution is a base as it turns red litmus solution blue. An acidic solution such as hydrochloric acid would reverse the change. In contrast, hydrochloric acid would turn blue litmus solution to red.


Other options such as baking powder, lime and ammonium hydroxide solution are basic compounds. So, these substances would not be able to reverse the change. These substances would only change red litmus solution to blue.

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