JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
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 \(1^{\text {st }}\) ionization energy of the boron is less than that of the beryllium
D. The electronegativity of C is 2.5 in \(\mathrm{CH}_4\) and \(\mathrm{CCl}_4\)
E. Li is the most electropositive among elements of group I
Choose the correct answer from the options gives below
- A B & C only
- B A, C and d only
- C B and D only
- D B,C and E only
Answer & Solution
Correct Answer
(A) B & C only
Step-by-step Solution
Detailed explanation
(A) The process of adding an \(\mathrm{e}^{-}\)to a neutral gaseous atom is not always exothermic it may be exothermic or endothermic. (C) \(\mathrm{Be} \quad \mathrm{B}\) \(1 s^2 2 s^2 \quad 1 s^2 2 s^2 2 p^1\) In Be 2 s subshell in fully filled So, need high energy to remove…
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