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p-Block Elements (Group 13 & 14) · Question 11

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

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. (B < Al), (Al < Ga), (Ga < In) and (In < Tl). Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (M3+) than the other one. The atomic number of the element (X) is

  1. 49
  2. 81
  3. 31
  4. 13

Answer

(3) 31

Solution

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

Ga has ten 3d electrons that shield the nucleus poorly, its atomic radius is less than that of Al.

The pair (Al < Ga) is incorrect.

Ionic radii ( M3+, pm): Al3+ 53.5, Ga3+ 62

X = Ga, atomic number 31

Answer: (3)

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

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
JEE Main 2025 (Online) 4th April Evening Shift
4

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
5

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
6

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
7

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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