JEE Main 2026 — Jan 21, Shift 2 — Chemistry solution

JEE Main2026Jan 21, Shift 2Chemistry

Given below are two statements:

Statement-I: The correct order in terms of atomic/ionic radii is Al > Mg > Mg $^{2 +}$ > Al $^{3 +}$ .

Statement-II: The correct order in terms of the magnitude of electron gain enthalpy is Cl > Br > S > O.

In the light of the above statements, choose the correct answer from the options given below:

A
Both Statement I and Statement II are false
B
Statement I is false but Statement II is true
C
Statement I is true but Statement II is false
D
Both Statement I and Statement II are true

Solution

Statement I — the actual atomic-radius order across this period is Mg > Al (Al has a higher effective nuclear charge as you move right across period 3). So the correct order is Mg > Al > Mg $^{2 +}$ > Al $^{3 +}$ , not the one given. Statement I is false.

Statement II — Cl has the largest magnitude of $∣Δ H_{e g} ∣$ among all elements; among halogens Cl > Br, and chlorine’s value also exceeds that of sulfur and oxygen (oxygen’s small size makes electron addition unfavourable due to repulsion). The order Cl > Br > S > O is correct. Statement II is true.

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