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p-Block Elements (Group 13 & 14) · Question 14

JEE Main 2025 (Online) 3rd April Evening ShiftMCQMedium📈 Topic in 32% papers+4−1
1

The correct orders among the following are Choose the correct answer from the options given below:

  1. B and D Only
  2. A and B Only
  3. C and D Only
  4. A and C Only

Answer

(1) B and D Only

Solution

NCERT data for group 13 elements:

Atomic radius (pm): B 85, Al 143, Ga 135, In 167, Tl 170

Ga < Al (poor shielding by 3d electrons), so B < Ga < Al < In < Tl. A is incorrect.

Electronegativity: B 2.0, Al 1.5, Ga 1.6, In 1.7, Tl 1.8

Al < Ga < In < Tl < B. B is correct.

Density ( g cm-3): B 2.35, Al 2.70, Ga 5.90, In 7.31, Tl 11.85

Density increases down the group: B < Al < Ga < In < Tl. C is incorrect.

First ionisation enthalpy ( kJ mol-1): B 801, Al 577, Ga 579, In 558, Tl 589

In < Al < Ga < Tl < B. D is correct.

B and D only.

Answer: (1)

JEE Main 2025 (Online) 3rd April Evening Shift

Keep practising — p-Block Elements (Group 13 & 14)

2

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but Statement II is incorrect
  2. Both Statement I and Statement II are correct
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are incorrect
JEE Main 2025 (Online) 2nd April Morning Shift
3

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

  1. E Sn4+/Sn2+ = +0.15 V
  2. E Al3+/Al = -1.66 V
  3. E Pb4+/Pb2+ = +1.67 V
  4. E Tl3+/Tl = +1.26 V
JEE Main 2025 (Online) 29th January Morning Shift
4

Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

  1. +4 and +1
  2. +4 and +3
  3. +1 and +4
  4. +2 and +3
JEE Main 2025 (Online) 28th January Morning Shift

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