Match List I with List II (Group-13 elements B, Al, Ga, In, Tl):
List-I: A. Melting point [K] B. Ionic Radius [M³⁺/pm] C. First ionization enthalpy [kJ mol⁻¹] D. Atomic Radius [pm]
List-II: I. Tl > In > Ga > Al > B II. B > Tl > Al ≈ Ga > In III. Tl > In > Al > Ga > B IV. B > Al > Tl > In > Ga
Choose the correct answer from the options given below:
List-I: A. Melting point [K] B. Ionic Radius [M³⁺/pm] C. First ionization enthalpy [kJ mol⁻¹] D. Atomic Radius [pm]
List-II: I. Tl > In > Ga > Al > B II. B > Tl > Al ≈ Ga > In III. Tl > In > Al > Ga > B IV. B > Al > Tl > In > Ga
Choose the correct answer from the options given below:
- (A)A-III, B-IV, C-I, D-II
- (B)A-II, B-III, C-IV, D-I
- (C)A-IV, B-I, C-II, D-III✓ Correct
- (D)A-I, B-II, C-III, D-IV
Answer: (C)
Solution
Group-13 (B, Al, Ga, In, Tl): A melting point → IV (B>Al>Tl>In>Ga, Ga anomalously low); B ionic radius M³⁺ → I (Tl>In>Ga>Al>B); C first ionization enthalpy → II (B>Tl>Al≈Ga>In); D atomic radius → III (Tl>In>Al>Ga>B). Mapping A-IV, B-I, C-II, D-III ⇒ (C). Key verified by periodic trends.
JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Single correct option