Which of the following statements are correct | vedclass

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(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.

Element Description	Element	$\Delta_{i}H_1$	$\Delta_{i}H_2$	$\Delta_{eg}H$
$(i)$ Most reactive non-metal	$(A)$	$419$	$3051$	$-48$
$(ii)$ Most reactive metal	$(B)$	$1681$	$3374$	$-328$
$(iii)$ Least reactive element	$(C)$	$738$	$1451$	$-40$
$(iv)$ Metal forming dihalide	$(D)$	$2372$	$5251$	$+48$

Similar Questions

The change in enthalpy $[\Delta H]$ in $kJ\ mol^{-1}$ for the reaction is $Mg + 2F \rightarrow MgF_2$. Given: $EA$ of $F = 328\ kJ\ mol^{-1}$,$IE_1$ of $Mg = 737\ kJ\ mol^{-1}$,$IE_2$ of $Mg = 1451\ kJ\ mol^{-1}$.

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