Assertion :In the acid-base titration involving a strong base and a weak acid, methyl orange can be used as an indicator Reason: Methyl orange changes its colour in pH range 3to5.
Read the above assertion and reason and choose the correct option regarding it.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is D Both Assertion and Reason are incorrect A weak acid will react with a strong base to form a basic (pH>7) solution.
Phenolphthalein is a suitable indicator for this titration. Methyl orange is not suitable for this titration because its pH range lies on the flat portion of the curve.