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NEET Sample Paper NEET Sample Test Paper-56

  • question_answer
    The increasing order of the first ionization enthalpy of the elements B, P, S and F (lowest first) is:

    A) B<P<S<F       

    B) B<S<P<F

    C) F<S<P<B       

    D) P<S<B<F

    Correct Answer: B

    Solution :

    [b] B < S < P < F B and F lie in the 2nd period while P and S lie in the third period. Because of higher effective nuclear charge, Ai Hi of P and S are higher B than that of but lower than that of F. Among P and S, P has higher \[\Delta \]iHi due to exactly half filled configuration. Thus overall increasing order, is:


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