Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2004

  • question_answer
    The correct order of electron affinity of B, C, N, O is

    A)  \[O>C>N>B\]

    B)  \[B>N>C>O\]

    C)  \[\text{O}>C>B>N\]

    D)  \[\text{O}>B>C>N\]

    Correct Answer: C

    Solution :

    The correct order of electron affinity of B, C, N, O is \[O>C>B>N\]. Electron affinity increases on moving from left to right in a period. Its reason is that atomic radius decreases in a period with increase in atomic number. But the electron affinity of element with half or full filled  orbital (having stable configuration) is lowest.
    B C N O
    EA \[0.16\] \[1.25\] \[-0.32\] \[1.47\]
    So, \[\text{O}>C>B>N\]


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