An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?
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(d) Hydrochloric acid
[D] Hydrochloric acid
Remember, if a solution is basic in nature, to reverse the change acid should be added to it, the solution turns red litmus to blue. Hence, choose HCl from the given option [D] as an answer.
[D] hydrochloric acid
If you understand the question, you will be finding that solution turns red litmus to blue. That means, it is a basic compound. An acid solution which is HCl would reverse the change.