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Which of the following statement(s) is (are) correct ?A. The electron affinity for sulphur is more exothermic than that for oxygenB. successive ionization energies of an atom always increaseC. First ionization energy of As is greater than that of SeD. Chlorine has larger atomic size as well as electron affinity than that of fluorine |
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Answer» Correct Answer - A,B,C,D (A)Oxygen atom is smaller as compared to sulphur, so in oxygen there is more inter-electronic repulsion than that of sulphur. (B)Charge increases so size decrease and number of electrons per proton also decreases, so valence shell electron gradually becomes more tightly held by the nucleus. (C )valence shell electron configuration of As is `ns^2 np^2` (half filled stable configuration) and valence shell electron configuration of Se is `ns^2 np^4` (partially filled less stable configuration) As=0.947 Mj/mole, Se=0.941 Mj/mole. (D)Down the group atomic size increases. Fluorine experiences more inter electronic repulsion than that of chlorine, so fluorine has less electron affinity than that of chlorin. |
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