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

  • question_answer 72) DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Which of the following will change red litmus paper to blue?

    A)   

    B)

    C)     

    D) Both (a) and (b)

    Correct Answer: D

    Solution :

    Both antacid and soap are basic in nature and therefore change red litmus paper to blue while table salt (sodium chloride) is a neutral salt. It does not give any colour change with litmus paper.

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