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JEE Main 20253 AprilMorning Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2025 · 3 April · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following statements are correct?A. The process of the...

Which of the following statements are correct?A. The process of the addition an electron to a neutral gaseous atom is always exothermicB. The process of removing an electron from an isolated gaseous atom is always endothermicC. The 1st 1^{\text{st }} ionization energy of the boron is less than that of the berylliumD. The electronegativity of C is 2.5 in CH4\mathrm{CH}_4 and CCl4\mathrm{CCl}_4E. Li is the most electropositive among elements of group IChoose the correct answer from the options gives belowWhich of the following statements are correct?A. The process of the addition an electron to a neutral gaseous atom is

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−\mathrm{e}^{-}to a neutral gaseous atom is not always exothermic it may be exothermic or endothermic.
(C) BeB\mathrm{Be} \quad \mathrm{B}
1s22s21s22s22p11 s^2 2 s^2 \quad 1 s^2 2 s^2 2 p^1
In Be 2 s subshell in fully filled
So, need high energy to remove e−\mathrm{e}^{-}as compared to B.
(D)
Which of the following statements are correct?A. The process of the addition an electron to a neutral gaseous atom is
due to partially positive charge zeff ↑,EN↑z_{\text{eff }} \uparrow, \mathrm{EN} \uparrow
So, EN of C⇒CCl4>CH4\mathrm{C} \Rightarrow \mathrm{CCl}_4 \gt \mathrm{CH}_4
(E) Cs is most electropositive.
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