JEE Main & Advanced JEE Main Paper (Held on 08-4-2019 Morning)

  • question_answer
    The correct order of hydration enthalpies of alkali metal ions is - [JEE Main 8-4-2019 Morning]

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

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

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

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

    Correct Answer: A

    Solution :

    Hydration enthalpy depends upon ionic potential (charge / size). As ionic potential increases hydration enthalpy increases. Correct option: (a)


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