A mixture of phenol and phthalic anhydride when heated with conc. $H_{2} S O_{4}$ forms ........................which is used as an indicator in acid-base titrations.

phenolphthalein

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methyl red

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methyl orange

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coumarin

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Solution

The correct option is A phenolphthalein
A mixture of phenol and phthalic anhydride when heated with conc. $H_{2} S O_{4}$ forms phenolphthalein which is used as an indicator in acid-base titrations.

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