JEE Main 2025 Jan 22 Shift 1, Chemistry Q6: Periodicity In Atomic Properties

JEE Main2025Jan 22, Shift 1Chemistry

Match List-I with List-II

List-I	List-II
(A) Al $^{3 +}$ $<$ Mg $^{2 +}$ $<$ Na $^{+}$ $<$ F $^{-}$	(I) Ionisation Enthalpy
(B) B $<$ C $<$ O $<$ N	(II) Metallic character
(C) B $<$ Al $<$ Mg $<$ K	(III) Electronegativity
(D) Si $<$ P $<$ S $<$ Cl	(IV) Ionic radii

Choose the correct answer from the options given below :

A
A-IV, B-I, C-III, D-II
B
A-II, B-III, C-IV, D-I
C
A-IV, B-I, C-II, D-III
D
A-III, B-IV, C-II, D-I

Solution

(A) For an isoelectronic series (all have 10 electrons), the ion with the highest nuclear charge is the smallest. So Al $^{3 +} <$ Mg $^{2 +} <$ Na $^{+} <$ F $^{-}$ is the ionic radii trend $\Rightarrow$ IV.

(B) Across period 2, IE rises but N (half-filled $2 p^{3}$ ) has an anomalously high IE, exceeding O. Hence B $<$ C $<$ O $<$ N matches ionisation enthalpy $\Rightarrow$ I.

(C) Metallic character increases on going down a group and from right to left across a period: B $<$ Al $<$ Mg $<$ K $\Rightarrow$ II.

(D) Across period 3, electronegativity increases: Si $<$ P $<$ S $<$ Cl $\Rightarrow$ III.

$∴$ A-IV, B-I, C-II, D-III.

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JEE Main 2025 Jan 22 Shift 1, Chemistry Q6: Periodicity In Atomic Properties

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