A substance's aqueous solution has excess hydrogen ions. What will happen to blue litmus?
Answer and explanation
Correct answer: It will turn red
The governing concept is the indicator test for an acidic solution. Excess hydrogen ions in water indicate that the solution is acidic, meaning its pH is below 7. Blue litmus changes to red in an acidic medium, so option A follows directly. Blue litmus does not normally become pink or white in this test, while remaining blue would indicate a neutral or basic condition rather than excess hydrogen ions.
Frequently asked questions
What is the correct answer to this question?
It will turn red
Why is this the correct answer?
The governing concept is the indicator test for an acidic solution. Excess hydrogen ions in water indicate that the solution is acidic, meaning its pH is below 7. Blue litmus changes to red in an acidic medium, so option A follows directly. Blue litmus does not normally become pink or white in this test, while remaining blue would indicate a neutral or basic condition rather than excess hydrogen ions.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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