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 $3$ to $5$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
In acid-base titration involving a strong base and weak acid, the equivalence point is usually produced greater than $p H = 7$ , So Methyl orange can't be used as an indicator because its ${p K}_{I n}$ is $3.74$ . So Assertion is incorrect.

Again at $p H$ values less than $3$ , methyl orange is red and a $p H$ values greater than $4.4$ , it will be yellow. So it cannot changes its colour in $p H$ range $3$ to $5$ .

Thus, Both Assertion and Reason are incorrect
Hence, the correct option is $D$

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