RAJASTHAN ­ PET Rajasthan PET Solved Paper-2012

  • question_answer The correct order of the mobility of the alkali metal ions in aqueous solution is

    A)  \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]

    B)  \[N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}>L{{i}^{+}}\]

    C)  \[{{K}^{+}}>R{{b}^{+}}>N{{a}^{+}}>L{{i}^{+}}\]

    D)  \[R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>L{{i}^{+}}\]

    Correct Answer: D

    Solution :

     The correct order of hydration energy of the alkali metal ions in aqueous solutions is \[L{{i}^{+}}>N{{a}^{+}}>{{K}^{+}}>R{{b}^{+}}\]and due to hydration of ion, mobility decreases. Thus, the correct order of the mobility of these ions is \[R{{b}^{+}}>{{K}^{+}}>N{{a}^{+}}>Li\]

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