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    Question

    Study the given diagram carefully. Which option

    correctly explains the reason for the appearance of the blue-black colour?
    A Potato juice contains proteins, which turn blue-black with iodine Correct Answer Incorrect Answer
    B Potato juice contains starch, which turns blue-black with iodine Correct Answer Incorrect Answer
    C Potato juice contains glucose, which turns blue-black with iodine Correct Answer Incorrect Answer
    D Potato juice contains fats, which turn blue-black with iodine Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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