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p-Block Elements (Group 13 & 14)

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

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)

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

Ques. 2JEE Main 2025, 3 April (Evening Shift)

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
Ques. 3JEE Main 2025, 2 April (Morning Shift)

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
Ques. 4JEE Main 2025, 29 January (Morning Shift)

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
Ques. 5JEE Main 2025, 28 January (Morning Shift)

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
Ques. 6JEE Main 2025, 24 January (Evening Shift)

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

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 7JEE Main 2025, 23 January (Evening Shift)

Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :

  1. 14
  2. 50
  3. 6
  4. 82
Ques. 8JEE Main 2024, 9 April (Evening Shift)

Match List I with List II Choose the correct answer from the options given below:

  1. A-IV, B-I, C-II, D-III
  2. A-I, B-II, C-III, D-IV
  3. A-III, B-IV, C-I, D-II
  4. A-II, B-III, C-IV, D-I
Ques. 9JEE Main 2024, 8 April (Morning Shift)

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: In the light of the above statements, choose the correct answer from the options given below:

  1. A is true but R is false.
  2. Both A and R are true but R is NOT the correct explanation of A.
  3. A is false but R is true.
  4. Both A and R are true and R is the correct explanation of A.
Ques. 10JEE Main 2024, 6 April (Morning Shift)

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

  1. Both Statement I and Statement II are true
  2. Statement I is true but Statement II is false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
Ques. 11JEE Main 2024, 6 April (Evening Shift)

The number of ions from the following that are expected to behave as oxidising agent is : Sn4+, Sn2+, Pb2+, Tl3+, Pb4+, Tl+

  1. 3
  2. 4
  3. 2
  4. 1

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