Phenolphthalein does not act as an indicator for the titration between

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$K O H$ and $C H_{3} C O O H$

$B a {(O H)}_{2}$ and $H C l$

$N a O H$ and $H_{2} S O_{4}$

$H C l$ and $N H_{4} O H$

answer is A.

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Detailed Solution

The pH range of indicator should lie in steep part of curve. 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 NH₄OH is a strong acid and weak base titration where phenolphthalein is useless as an indicator

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