JEE Main 2026 — Apr 2, Shift 2 — Chemistry solution

JEE Main2026Apr 2, Shift 2Chemistry

Given below are two statements :

Statement-I : The second ionization enthalpy of B, Al and Ga is in the order of B $>$ Al $>$ Ga.

Statement-II : The correct order in terms of first ionization enthalpy is Si $<$ Ge $<$ Pb $<$ Sn.

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

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

Solution

Statement-I: The actual second ionisation enthalpies (kJ/mol) for Group $13$ elements are $B \approx 2427$ , $Ga \approx 1979$ , $Al \approx 1816$ . The order is B $>$ Ga $>$ Al (Ga's IE2 exceeds Al's due to poor shielding by $3 d$ electrons). The given order is incorrect.

Statement-II: The first ionisation enthalpies (kJ/mol) for Group $14$ elements are Si $\approx 786$ , Ge $\approx 761$ , Sn $\approx 708$ , Pb $\approx 715$ . The actual order is Sn $<$ Pb $<$ Ge $<$ Si (Pb's IE1 exceeds Sn's owing to relativistic effects and poor shielding). The given order is also incorrect.

Hence both statements are false.

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