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 - 4 Indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, China rose petals (Gudhal), etc., are some naturally occurring indicators. Naturally occurring indicator litmus

    A) is extracted from lichens

    B) has available as red and blue litmus paper

    C) has purple colour in distilled water

    D) All the above are correct

    Correct Answer: D

    Solution :

    Litmus is extracted from lichens.

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