7th Class Science Acids, Bases and Salts Question Bank Acids, Bases and Salts

  • question_answer 78) When few drops of phenolphthalein are added to sample 'A' it turned pink. To this pink coloured solution we added a few drops of sample 'B'. With continuous stirring the pink colour disappears. Samples 'A' and 'B' are:

    A) sample 'A' is acidic and sample 'B' is basic.

    B) sample 'A' is basic and sample 'B' is acidic.

    C) sample 'A' is basic and sample 'B' is neutral.

    D) sample 'A' is acidic and sample 'B' is neutral.

    Correct Answer: B

    Solution :

    Phenolphthalein shows pink colour in basic solution and is colourless in acidic solution.

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