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JCECE Engineering JCECE Engineering Solved Paper-2014

  • question_answer
    The electrons, identified by quantum numbers\[n\] and\[l\], (i)\[n=4,\,\,l=1\](ii)\[n=4,\,\,l=0\] (iii)\[n=3,\,\,l=2\](iv)\[n=3,\,\,l=1\]can be placed in order of increasing energy, from the lowest to highest, as

    A)  (iv) < (ii) < (iii) < (i)

    B)  (ii) < (iv) < (i) < (iii)

    C)  (i) < (iii) < (ii) < (ii)

    D)   (iii) < (i) < (iv) < (ii)

    Correct Answer: A

    Solution :

    \[(i)\,\,4p\,\,(ii)\,\,4s\,\,(iii)\,\,3d\,\,(iv)\,\,3p\] According to Aufbau rule, order of increasing energy is\[3p<4s<3d<4p\].


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