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

  • question_answer
    If the ionization enthalpy and electron gain enthalpy of an element are 275 and\[86\text{ }kcal\text{ }mo{{l}^{-1}}\] respectively, then the electronegativity of the element on the Pauling scale is:

    A) 2.8       

    B) 0.0    

    C) 4.0                   

    D) 2.6

    Correct Answer: A

    Solution :

    [a] \[I.E.+E.A.=275+86=361\text{ }kcal\text{ }mo{{l}^{-1}}\] \[=361\times 4.184=1510.42\text{ }kJmo{{l}^{-1}}\] \[\therefore \] Electronegativity\[=\frac{1510.42}{540}\] \[=2.797=2.8\]


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