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 can you obtain the substance Z?

    A) By the reaction of X and Y

    B) By dissolving X in water

    C) By dissolving Y in water

    D) Cannot be said

    Correct Answer: A

    Solution :

    Z is either water or salt, both of which can be obtained from the reaction between acid and a base. Since X is a base and Y is an acid, Z can be obtained from the reaction between X and Y.


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