Question

An aqueous solution turns the blue litmus solution red. Excess addition of which of the following solution would reverse the change ?
(a) Baking powder
(b) Suphuric acid
(c) Nitric acid
(d) Hydrochloric acid

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Answer 1

Answer:

d. Hydrochloric acid.

Explanation:

An aqueous solution is base. The addition of a base would turn the blie litmus solution red. So, to reverse the soultion, hydrochloric acid should be added to it.