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J & K CET Engineering J and K - CET Engineering Solved Paper-2015

  • question_answer
    Among P, S, Cl, F, the elements with most negative and least negative electron gain enthalpy respectively, are

    A)  CI, S

    B)  F, S

    C)  CI, P

    D)  F, P

    Correct Answer: C

    Solution :

     Generally, electron gain enthalpy increases as we move from left to right in a period and decreases as we go down in a group. But electron affinities of second period elements (F, N) are less negative as compared to corresponding third period element. This is because of the small atomic size of second period elements. Hence, the correct order electron affinities is \[P<S<F<\,Cl\] Least negative (EA)      Most negative (EA)


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