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

  • question_answer DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 Three different substances were taken and tested with litmus paper. The results are given below. Based on the results answer the questions 43 to 48.
    Type of Litmus X Y Z
    Red litmus turns blue no change no change
    Blue litmus no litmus turns red no change
    How will the substance X behave with phenolphthalein?

    A) It turns pink

    B) It remains colorless

    C) It turns blue

    D) It turns red

    Correct Answer: A

    Solution :

    In basic medium phenolphthalein turns pink.


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