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KVPY Sample Paper KVPY Stream-SX Model Paper-26

  • question_answer
    Boric acid cannot be titrated with \[NaOH\]satisfactorily because as a strong acid. However, on addition by it is a weak acid. But on addition of diols it behaves as a strong acid. However, on addition of which of the following diols, the titration with \[NaOH\] is still not satisfactory on using phenolphthalein as indicator?

    A) Glycerol

    B) Mannitol

    C) Sorbitol

    D) Ethylene glycol

    Correct Answer: D

    Solution :

    The \[cis\]-diol forms very stable complexes with the \[{{[B{{(OH)}_{4}}]}^{-}}\] so effectively removing it from solution. Due to disturbance in reversibility. The reaction proceeds completely to the right. Thus all the \[B(O{{H}_{3}})\]reacts with \[NaOH\] in effect it acts as a strong acid in the presence of the cis-diol except ethylene glycol     


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