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Which of the following will not be soluble in sodium hydrogen carbonate?

1. 2, 4, 6-trinitrophenol
2. Benzoic acid
3. o-Nitrophenol
4. Benzene sulphonic acid

Correct answer: o-Nitrophenol

Solution

o-Nitrophenol is a weaker acid compared to the other options and does not react with sodium hydrogen carbonate to form a soluble salt, unlike stronger acids such as benzoic acid or benzene sulphonic acid.

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