A compound ' $X$ ' is a weak acid and it exhibits colour change at $pH$ close to the equivalence point during neutralization of $NaOH$ with ${CH}_{3} COOH$ . Compound ' $X$ ' exists in ionized form in basic medium. The compound ' $X$ ' is :

methyl orange

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phenolphthalein

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erichrome Black T

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methyl red

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Solution

The correct option is B phenolphthalein
Phenolphthalein is a weak acid. It exists in ionic form in basic solutions and gives colour. That's why it is used as an indicator in titrations as well.

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