Home › UP Board Class 10 › science › Acids, Bases and Salts › Phenolphthalein in a sodium hydroxide solution is:
Phenolphthalein in a sodium hydroxide solution is:
Acolourless
Bred
Cpink
Dyellow
Answer & Solution
Correct answer: C. pink
NaOH is a strong base. Phenolphthalein is colourless in acid and pink in base — so it turns pink.
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