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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    Arrange the acids (I) \[{{H}_{2}}S{{O}_{3}}\] (II) H3PO3 and (III) HClO3 in the decreasing order of acidity   [UPSEAT 2001]

    A)                 I > III > II              

    B)                 I > II > III

    C)                 II > III > I              

    D)                 III > I > II

    Correct Answer: D

    Solution :

                    Acidity is directly propotional to oxidation number. As the O.No. of S, P and Cl in \[{{H}_{2}}S{{O}_{3}},{{H}_{3}}P{{O}_{3}}\] & \[HCl{{O}_{3}}\] is +4, +3 & +5 respectively so decreasing order of acidity will be III > I > II.


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