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

  • question_answer 99) The two types of litmus paper are:

    A) blue and red   

    B) blue and yellow

    C) red and green              

    D) yellow and red

    Correct Answer: A

    Solution :

    Blue litmus paper is used to detect presence of acids. Red litmus paper is used to detect presence of bases.

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