Given below are two statements : Statement (\(\mathbf{I}\)): The radii of isoelectronic species increases in…

Given below are two statements :
Statement (\(\mathbf{I}\)): The radii of isoelectronic species increases in the order.
\(\mathrm{Mg}^{2+} \lt \mathrm{Na}^{+} \lt \mathrm{F}^{-} \lt \mathrm{O}^{2-}\)
Statement (II): The magnitude of electron gain enthalpy of halogen decreases in the order.
\(\mathrm{Cl} \gt \mathrm{F} \gt \mathrm{Br} \gt \mathrm{I}\)
In the light of the above statements, choose the most appropriate answer from the options given below :
  1. Statement I is incorrect but Statement II is correct
  2. Statement I is correct but Statement II is incorrect
  3. Both Statement I and Statement II are incorrect
  4. Both Statement I and Statement II are correct

Solution

$\mathrm{r} \propto \mathrm{q}^{-}$(for isoelectronic species)
$\propto \frac{1}{q^{+}}$
$\therefore$ Statement I is correct
Magnitude of electron gain enthalpy
$\mathrm{Cl}>\mathrm{F}>\mathrm{Br}>\mathrm{I}$

Asked in: JEE Main 2025 (29 Jan Shift 1)

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