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JEE Main20253 Apr 2025Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Which of the following statements are correct? A. The process of the addition an electron to a neutral gaseous atom is always exothermic B. The process of removing an electron from an isolated gaseous atom is always endothermic C. The 1^ st ionization energy of the boron is less than that of the beryllium D. The electronegativity of C is 2.5 in CH ₄ and CCl ₄ E. Li is the most electropositive among elements of group

Options

  1. AB & C only
  2. BA, C and d only
  3. CB and D only
  4. DB,C and E only

Correct answer

A. B & C only

Step-by-step solution

(A) The process of adding an e ⁻ to a neutral gaseous atom is not always exothermic it may be exothermic or endothermic. (C) Be B 1 s^2 2 s^2 1 s^2 2 s^2 2 p^1 In Be 2 s subshell in fully filled So, need high energy to remove e ⁻ as compared to B. (D) due to partially positive charge z_ eff , EN So, EN of C CCl ₄ CH ₄ (E) Cs is most electropositive.

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