Assertion :In an acid-base titration involving strong base and a weak acid, methyl orange can be used as an indicator. Reason: Methyl orange changes its colour in $p H$ range of $7$ to $9$ .

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 a titration of strong base and weak acid phenolphthalein is used as indicator. Methyl orange changes its colour in $p H$ of range 3 to 5

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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