BCECE Medical BCECE Medical Solved Papers-2010

  • question_answer
    Select the correct order of the strength of acids given below

    A)  \[HCl{{O}_{4}}<HCl{{O}_{3}}<HClO<HCl{{O}_{2}}\]

    B)  \[HCl{{O}_{4}}<HCl{{O}_{3}}<HCl{{O}_{2}}<HClO\]

    C)  \[HClO<HCl{{O}_{2}}<HCl{{O}_{3}}<HCl{{O}_{4}}\]

    D)  None of the above

    Correct Answer: C

    Solution :

    Greater the oxidation number of central atom in oxyacids, more will be its acidic strength. (i) \[HCl{{O}_{4}}\] Let the oxidation state of \[Cl\]in \[HCl{{O}_{4}}=x\] \[\therefore \,\,+1+x+(-2\times 4)=0\] \[\therefore \] \[x=+7\] (ii) \[HCl{{O}_{2}}\] Let the oxidation state of \[Cl\] in \[HCl{{O}_{3}}=x\] \[+1+x+(-2\times 3)=0\]                 \[x=+5\] (iii) \[HClO\] Let the oxidation state of \[Cl\]in \[HCl{{O}_{2}}=x\] \[\therefore \,\,+1+x+(-2\times 2)=0\] \[\therefore \] \[x=+3\] (iv) \[HClO\] Let the oxidation state of \[Cl\] in \[HClO=x\] \[\therefore \] \[+1+x+(-2)=0\] \[\therefore \] \[x=+1\] \[\therefore \] The correct order of strength of acids is \[HClO<HCl{{O}_{2}}<HCl{{O}_{3}}<HCl{{O}_{4}}\]


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