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NEET Chemistry NEET PYQ-Electrochemistry

  • question_answer
    At \[25{}^\circ C\] molar conductance of 0.1 molar aqueous   solution   of ammonium hydroxide is \[9.54\,\,\,oh{{m}^{-1}}\,\,c{{m}^{2}}\,\,mo{{l}^{-1}}\] and at infinite dilution its molar conductance is \[238\,\,oh{{m}^{-1}}\,c{{m}^{2}}\,mo{{l}^{-1}}\]. The degree of ionization of ammonium hydroxide at the same concentration and temperature is [NEET 2013]  

    A) 2.080%

    B) 20.800%

    C) 4.008%

    D) 40.800%

    Correct Answer: C

    Solution :

    [c] Given, molar conductance at 0.1 M concentration,
    \[{{\lambda }_{c}}=9.54\,\,{{\Omega }^{-1}}c{{m}^{2}}mo{{l}^{-1}}\]
                Molar conductance at infinite dilution,
                            \[\lambda _{c}^{\infty }=238\,\,{{\Omega }^{-1}}c{{m}^{2}}mo{{l}^{-1}}\]
                We know that,
                Degree of ionization,\[\alpha =\frac{\lambda _{c}^{{}}}{\lambda _{c}^{\infty }}\times 100\]
                \[=\frac{9.54}{238}\times 100=4.008%\]


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