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    Question

    Given below are two statements: one is labelled as

    Assertion A and the other is labelled as Reason R.  Assertion A: The colloidal surfaces of humus are negatively charged. Reason R: The negative charges arise from exposed functional groups like hydroxyl, carboxylic or phenolic.  In the light of the above statements, choose the most appropriate answer from the options given below:
    A Both A and R are true and R is the correct explanation of A. Correct Answer Incorrect Answer
    B Both A and R are true but R is not the correct explanation of A. Correct Answer Incorrect Answer
    C A is true but R is false. Correct Answer Incorrect Answer
    D A is false but R is true. Correct Answer Incorrect Answer

    Solution

    Both the assertion and reason are correct. 

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