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

  • question_answer DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In three test- tubes 'A', 'B', 'C' with solutions of different substances were added a few drops of China rose indicator. The colours shows in these test-tubes were magenta, colourless and green respectively Select the correct set indicating the substance whose solution are there in these test-tubes.

    A)

    ?A? ?B? ?C?
    Sugar solution Lime water Lime juice

    B)

    ?A? ?B? ?C?
    Sugar solution Lime juice Lime water

    C)

    ?A? ?B? ?C?
    Lime water Sugar Solution Lime juice

    D)

    ?A? ?B? ?C?
    Lime juice Sugar solution Lime water

    Correct Answer: D

    Solution :

    Lime juice is acidic and china rose shows magenta colour in acidic media. Sugar solution is neutral and China rose remains colourless. Lime water is basic and China rose shows green colour in basic media.

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