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  5. The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I

12th Class Chemistry The p-Block Elements-I / p-ब्लॉक के कुछ तत्व-I Question Bank MCQs - The p-Block Elements

  • question_answer
    Colour of KI solution containing starch turns blue when chlorine water is added to it. This happens because

    A) chlorine displaces iodine from solution which gives blue colour with starch

    B) chlorine reacts with potassium iodide solution to form a blue precipitate

    C) iodine which is liberated is more soluble in KI resulting in blue colour

    D) chlorine acts as bleaching agent which decolourises KI and becomes blue

    Correct Answer: A

    Solution :

    Chlorine being more reactive displaces iodine from Kl. Iodine reacts with starch and gives blue colour.  \[2KI+C{{l}_{2}}+2KCl+{{I}_{2}}\] \[{{I}_{2}}\]+Starch\[\to \]Blue Colour


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