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Q.

Phenolphthalein cannot be used in the titration of

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a

CH3COOH with NaOH

b

HCI with NaOH

c

HCI with NH4OH

d

CH3COOH with NH4OH

answer is C.

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Detailed Solution

Phenolphthalein indicator distinguishes the pH change between pH 8 to 10. Therefore, it is used for strong acid and strong base titrations or weak acid and strong base titrations. In the given options, HCl and NH4​OH is a strong acid and weak base respectively, therefore in this titration, phenolphthalein is useless as an indicator.

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Phenolphthalein cannot be used in the titration of