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

  • question_answer 124) DIRECTIONS: The questions in this segment consists of two statements, one labelled as ?Assertion A? and the other labelled as ?Reason R?. You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The substance which shows the nature of a solution as acidic or basic with the change in colour are called indicators. Reason (R): Red litmus turns blue in a solution containing vitamin 'C'.

    A) Both A and R are true and R is the correct explanation of A.

    B) Both A and R are true but R is not the correct explanation of A.

    C) A is true but R is false.

    D) A is false but R is true.

    Correct Answer: C

    Solution :

    Assertion is correct but reason is incorrect. Indicators gives different colour in different medium. Vitamin C is a acid which turns litmus colour from red to blue.

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