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  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-12

  • question_answer
    Precautions to be taken in the study of reaction rate for the reaction between potassium iodate \[(KI{{O}_{3}})\] and sodium sulphite \[(N{{a}_{2}}S{{O}_{3}})\] using starch solution as indicator at different concentrations and temperature

    A)  The concentration of sodium thiosulphate solution should always be less than the concentration of the potassium iodide solution.

    B)  Freshly prepared starch solution should be used

    C)  Experiments should be performed with the fresh solutions of \[{{H}_{2}}{{O}_{2}}\] and KI.

    D)  All of these

    Correct Answer: D

    Solution :

     [a] The concentration of sodium thiosulphate solution should always be less than the concentration of the potassium iodide solution. [b] Freshly prepared starch solution should be used Experiments should be performed with the fresh solutions of \[{{H}_{2}}{{O}_{2}}\]and KI.


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