Methyl orange is red in a solution, but it becomes yellow when base is added slowly. What does this show?
Answer and explanation
Correct answer: Acidity decreased and the solution became basic or nearly neutral
Methyl orange is an acid-base indicator: it appears red in a sufficiently acidic medium and yellow in a neutral or alkaline medium. Adding a base consumes some of the acid, so the hydrogen-ion concentration decreases and the pH rises. The colour change therefore shows movement from acidic conditions toward neutral or basic conditions. It does not indicate metal formation, carbon dioxide formation, or increasing acidity. Hence option A is correct.
Frequently asked questions
What is the correct answer to this question?
Acidity decreased and the solution became basic or nearly neutral
Why is this the correct answer?
Methyl orange is an acid-base indicator: it appears red in a sufficiently acidic medium and yellow in a neutral or alkaline medium. Adding a base consumes some of the acid, so the hydrogen-ion concentration decreases and the pH rises. The colour change therefore shows movement from acidic conditions toward neutral or basic conditions. It does not indicate metal formation, carbon dioxide formation, or increasing acidity. Hence option A is correct.
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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