Q.

A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with CH3 COOH. Compound 'X' exists in ionized form in basic medium. The compound 'X' is :

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a

phenolphthalein

b

methyl orange

c

methyl red

d

erichrome Black T

answer is C.

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Detailed Solution

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Phenolphthalein is a weak acid that gives colour in basic medium.
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