Phenolphthalein gives pink colour on adding to :

N H_{4} O H

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N a O H

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C a {(O H)}_{2}

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any of the above

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Solution

The correct option is D any of the above
Phenolphthalein is commonly used indicator for titrations and is a weak acid. It gives pink colour in alkali solutions.

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Why does pink colour appear on gradually adding sodium hydroxide to a solution of acid having 2-3 drops of phenolphthalein?

N a O H

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