Phenolphthalein is an acid-base indicator that is colourless in acidic and gives pink colour in basic medium.

Class 10 Chemistry Chapter Acids Bases and Salts Important Multiple Choice questions (MCQs)and answers: 1. Which one of the following substances cannot be classified as Arrhenius base? A. NaOH B. KOH C.NH4OH D.NH3 Ans  D.NH3 Reason  According to Arrhenius’s concept “a base is a substance that ionizes in water to produce OH- ions. Arrhenius’s theory is …

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