What is the change in phenolphthalein in presence of $N a H S O_{4}$ ?

Pink

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Blue

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Red

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No color change

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Solution

The correct option is B No color change
Phenolphthalein is the most common synthetic indictor which is colorless. It remains colorless with acid but with base it turns to pink.

$N a H S O_{4}$ is an acid salt. It release of $H^{+}$ ions along with $N a^{+}$ ions.

Hence, phenolphthalein remains colorless when treated with $N a H S O_{4}$ .

Option D is correct.

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