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Q.

Sodium hydroxide turns phenolphthalein solution to:
 


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a

Yellow

b

Pink

c

Colourless

d

Orange 

answer is A.

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Detailed Solution

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Sodium hydroxide turns phenolphthalein solution pink.
Phenolphthalein is itself a weak acid. In an alkaline solution, phenolphthalein gives pink colour in a basic solution because it acts as an indicator. When a few drops of phenolphthalein indicator is added to sodium hydroxide, the solution changes its colour to pink. It reacts with the hydroxide ion of a base. This indicates that sodium hydroxide is a base.
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