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VMMC VMMC Medical Solved Paper-2011

  • question_answer
    In the titration of \[\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\]and \[\text{HCl,}\]the indicator  used is

    A) methyl orange 

    B) methylene blue

    C)                         phenolphthalein

    D)         litmus

    Correct Answer: A

    Solution :

    pH of the solution at the equivalence point is on the acidic side due to dissolution of \[\text{C}{{\text{O}}_{\text{2}}}\]formed. A slight excess of strong acid lowers the. pH to 3.5 when methyl orange produces red colour.


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