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An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
  • a)
    Baking powder
  • b)
    Lime
  • c)
    Ammonium hydroxide solution
  • d)
    Hydrochloric acid
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
An aqueous solution turns red litmus solution blue. Excess addition of...
The solution turns red litmus to blue it means that it is basic in nature, to reverse the change acid should be added to it. Thus, out of the given options hydrochloric acid is the correct answer.
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Most Upvoted Answer
An aqueous solution turns red litmus solution blue. Excess addition of...
Explanation:

When an aqueous solution turns red litmus solution blue, it indicates that the solution is basic in nature. This means that the solution has a pH greater than 7. To reverse this change and make the solution acidic, we need to add an acidic solution.

Among the given options, the only solution that is acidic in nature is hydrochloric acid (HCl). HCl is a strong acid and when added to the basic solution, it will neutralize the base and make the solution acidic.

Why the other options are not correct:

a) Baking powder: Baking powder is a mixture of a weak acid (such as cream of tartar) and a base (such as baking soda). When added to water, it reacts to produce carbon dioxide gas, which causes the dough or batter to rise. Baking powder is not a strong enough acid to reverse the change.

b) Lime: Lime is a basic substance (calcium oxide or calcium hydroxide), so adding it to the solution would only make it even more basic.

c) Ammonium hydroxide solution: Ammonium hydroxide is a weak base, so adding it to the solution would not reverse the change. It would make the solution even more basic.

Summary:

In summary, the only solution among the given options that can reverse the change of turning red litmus solution blue is hydrochloric acid. This is because hydrochloric acid is a strong acid that can neutralize the base and make the solution acidic.
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An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?a)Baking powderb)Limec)Ammonium hydroxide solutiond)Hydrochloric acidCorrect answer is option 'D'. Can you explain this answer?
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