Statement I: The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na<Li<Cl<F.
Statement II : The correct order of negative electron gain enthalpy values of Li, Na, F and Cl is Na<Li<F<Cl
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✓ Correct
(B)Both Statement I and Statement II are false
(C)Statement I is false but Statement II is true
(D)Statement I is true but Statement II is false
Answer: (A)
Solution
Statement I: first ionization enthalpies follow Na < Li < Cl < F. Na is lowest (largest atom among these, weak hold on outer electron); among the halogens, F's very small size gives it the highest ionization enthalpy despite the usual group trend — this order (Na < Li < Cl < F) is the well-established experimental one. True. Statement II: negative electron gain enthalpy magnitude follows Na < Li < F < Cl. Cl has a larger (more negative) electron gain enthalpy than F because F's very small atomic size causes significant electron–electron repulsion in its compact 2p subshell when accepting an extra electron, reducing the energy released. True. Both statements are correct.Ionization and electron gain enthalpy values
JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Single correct option
