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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Wet Test for Acid Radical

  • question_answer
    Starch can be used as an indicator for the detection of traces of [CPMT 1992]

    A) Glucose in aqueous solution

    B) Proteins in blood

    C) Iodine in aqueous solution

    D) Urea in blood

    Correct Answer: C

    Solution :

      Starch is colourless but \[\text{Starch }+\ \underset{\text{(violet)}}{\mathop{\text{Iodine}}}\,\text{ }\to \ \underset{\text{(blue-black)}}{\mathop{\text{Starch Iodine}}}\,\]


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