Which of the following substances would change the colour of the solution, if a substance is added to a solution containing two drops of phenolphthalein resulting the solution becomes pink?

H C l

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H_{2} C O_{3}

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K O H

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C H_{3} C H_{2} O H

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C H_{3} O H

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Solution

The correct option is B $K O H$
Phenolphthalein is often used as an indicator in acid-base titrations. It turns colorless in acidic solutions and pink in basic solutions. When a base is added to the phenolphthalein, the molecule $⇋$ ions equilibrium shifts to the right, leading to more ionization as $H^{+}$ ions are removed.

In the given options base is $K O H$ which would change the color of the acidic solution containing phenolphthalein. The colour changes from colourless to pink.

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