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

JEE Main 2025 (Online) 4th April Evening ShiftMCQEasy📈 Topic in 32% papers+4−1
1

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :

  1. B & Tl
  2. Tl & B
  3. B & In
  4. B & Ga

Answer

(3) B & In

Solution

First ionisation enthalpies of Group 13 elements (in kJ mol-1), as per NCERT:

B = 801, Al = 577, Ga = 579, In = 558, Tl = 589

B is the smallest atom with the highest effective nuclear charge on its 2p electron highest i H1.

From Al to In the size increases, so i H1 falls; Ga is slightly higher than Al because the poorly shielding 3d electrons raise the effective nuclear charge.

Tl has poorly shielding 4f and 5d electrons, so its i H1 (589) rises above that of In.

Highest: B; lowest: In

Answer: (3)

JEE Main 2025 (Online) 4th April Evening Shift

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

2

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
JEE Main 2025 (Online) 3rd April Evening Shift
3

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
4

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
5

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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