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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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