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Question

A few drops of phenolphthalein indicator were added to an unknown solution A. It acquired a pink colour. Now another unknown solution B was added to it drop by drop and the solution became colourless. Predict the nature of A & B.

Hard

Solution

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is basic in nature as phenolphthalein has imparted pink color to it. Solution is acid as it has made solution colorless by neutralizing its basic nature. 

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