Methyl orange is red in a solution. On adding base, its colour becomes yellow. What is the conclusion?
Answer and explanation
Correct answer: The solution moved from acidity toward less acidic or basic condition
Methyl orange is red in a sufficiently acidic medium and yellow in a neutral or alkaline medium, with a transition range between them. Adding a base consumes some hydrogen ions and shifts the solution away from strong acidity. The yellow colour therefore indicates movement toward a less acidic, neutral, or basic condition. Option A is correct; the observation does not prove that a metal formed or that no chemical change occurred.
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What is the correct answer to this question?
The solution moved from acidity toward less acidic or basic condition
Why is this the correct answer?
Methyl orange is red in a sufficiently acidic medium and yellow in a neutral or alkaline medium, with a transition range between them. Adding a base consumes some hydrogen ions and shifts the solution away from strong acidity. The yellow colour therefore indicates movement toward a less acidic, neutral, or basic condition. Option A is correct; the observation does not prove that a metal formed or that no chemical change occurred.
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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