Which of the following statements are correct | vedclass

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Question

(A) Incorrect: The process of adding an $e^-$ to a neutral gaseous atom is not always exothermic; it can be endothermic for elements like noble gases

Vedclass · Accepted Answer

$B$ and $C$ only

Vedclass · Answer

(A) Incorrect: The process of adding an $e^-$ to a neutral gaseous atom is not always exothermic; it can be endothermic for elements like noble gases or nitrogen.$(B)$ Correct: Removing an electron requires energy to overcome the electrostatic attraction between the nucleus and the electron,making it always endothermic.$(C)$ Correct: $Be$ $(1s^2 2s^2)$ has a fully filled $2s$ subshell,which is more stable than $B$ $(1s^2 2s^2 2p^1)$. Thus,the $1^{st}$ ionization energy of $Be > B$.$(D)$ Incorrect: Electronegativity is not a constant value; it depends on the oxidation state and hybridization. In $CCl_4$,the carbon atom is bonded to highly electronegative $Cl$ atoms,which increases its effective nuclear charge and thus its electronegativity compared to $C$ in $CH_4$.$(E)$ Incorrect: Electropositive character increases down the group. $Cs$ is the most electropositive element in group $I$.Therefore,only statements $B$ and $C$ are correct.

Similar Questions

Which has maximum $EA$,$EN$ and $IP$ respectively $:-$
$A = 1s^2 \ 2s^2 \ 2p^6$
$B = 1s^2 \ 2s^2 \ 2p^6 \ 3s^2 \ 3p^5$
$C = 1s^2 \ 2s^2 \ 2p^5$
$D = 1s^2 \ 2s^2 \ 2p^6 \ 3s^1$

Arrange the elements $N$,$P$,$O$,and $S$ in the order of:
$(i)$ Increasing first ionisation enthalpy.
$(ii)$ Increasing non-metallic character.
Give reasons for the arrangement assigned.

Which of the following orders is correct for the property mentioned in brackets?

Which of the following orders is $NOT$ correct with respect to the mentioned properties?

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