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AIIMS AIIMS Solved Paper-2015

  • question_answer
    Following table shows the successive molar ionisation energy \[{{S}_{2}}(g)+2{{O}_{2}}(g)\to 2S{{O}_{2}}(g);\Delta G=-544KJ\] of five elements A to E.
    Element Lonisation energy \[2Zn(s)+{{S}_{2}}(g)\to 2ZnS(s);\Delta G=-293KJ\]
    1st 2nd 3rd 4th
    A B C D E 2080 4600 1500 1800 3100 4000 500 740 580 420 6100 6900 7700 2700 4400 9400 9500 10500 11600 5900.
    Which two elements are most likely to be in the same group of the periodic table?

    A) C and D

    B) D and E

    C) B and D

    D) B and E

    Correct Answer: D

    Solution :

    In both B and E, after losing one electron there is sudden huge increase in ionisation energy. It means that after losing one electron, some stable configuration is achieved. So, both of them belong to the same group of the periodic table.


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