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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Mock Test - Classification Elements Periodicity Properties

  • question_answer
    \[I{{E}_{1}}\] and \[I{{E}_{2}}\] of Mg are 178 and 348 kcal \[mo{{l}^{\,-\,1}}\]. The energy required for the reaction \[Mg\xrightarrow{{}}M{{g}^{2+}}+2\,\,{{e}^{-}}\] is

    A) +170 kcal        

    B) +526 kcal

    C) -170 kcal         

    D) -526 kcal

    Correct Answer: B

    Solution :

    [b]  \[(i)\text{ }M{{g}_{(g)}}\to M{{g}^{\oplus }}_{(g)}+{{e}^{-}},\text{ }I{{E}_{1}}=178kcalmo{{l}^{-1}}\] \[(ii)\text{ }M{{g}^{\oplus }}_{(g)}\to M{{g}_{(g)}}^{2+}+{{e}^{-}},\,\,\,I{{E}_{2}}=348kcalmo{{l}^{-1}}\] Adding (i) and (ii), we have \[M{{g}_{(g)}}\to M{{g}^{2+}}_{(g)}+2{{e}^{-}}\] \[\therefore E=I{{E}_{2}}+I{{E}_{2}}=178+348=526kcal\]


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