BCECE Engineering BCECE Engineering Solved Paper-2013

  • question_answer
    In HNC, which element has least value of formal charge?

    A) H                            

    B)        N

    C) C                            

    D)                        All have same value

    Correct Answer: C

    Solution :

    Formal charge, \[F=V-\frac{s}{2}-U\] Where, v = valency electrons s = shared electrons u = unshared electrons \[\underset{\text{2}\,\text{shared}\,\text{electrone}}{\mathop{H-N}}\,\equiv \underset{\text{6}\,\text{unshared}\,\text{electrons}}{\mathop{C:\leftarrow 2}}\,\]
    H N C
    v 1 5 4
    s 2 8 6
    u 0 0 2
    F 0 1 \[-1\]


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