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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
    First three ionisation energies (in kJ/mol) of three representative elements are given below:
    Element \[I{{E}_{1}}\] \[I{{E}_{2}}\] \[I{{E}_{3}}\]
    P 495.8 4562 6910
    Q 737.7 1451 7733
    R 577.5 1817 2745
    Then incorrect option is:

    A) Q: Alkaline earth metal

    B) P: Alkali metals

    C) R: s-block element

    D) They belong to same period

    Correct Answer: C

    Solution :

    [c] R is p-block element, because difference between \[I{{E}_{2}}\] and \[~I{{E}_{3}}\] is not very high as compared to between\[I{{E}_{1}}\] and \[I{{E}_{2}}\]; hence stable oxidation state of R will be higher than +2.


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