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Classification of Elements and Periodicity in Properties · Question 18

JEE Main 2026 (Online) 22nd January Evening ShiftMCQMedium📈 Topic in 42% papers+4−1
1

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 false
  2. Statement I is false but Statement II is true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are true

Answer

(4) Both Statement I and Statement II are true

Solution

Statement I: First ionization enthalpies ( kJ mol-1): C 1086, N 1402, O 1314, F 1681

N has the extra-stable half-filled 2p3 configuration, its ionization enthalpy is higher than that of O.

C < O < N < F. Statement I is true.

Statement II: Electron gain enthalpies ( kJ mol-1): O −141, S −200, Se −195, Te −190, Po −174

O is very small, the added electron enters the compact 2p subshell and faces strong inter-electronic repulsion, so the electron gain enthalpy of O is less negative than that of S; down the group from S it becomes less negative.

Magnitude order: S > Se > Te > Po > O. Statement II is true.

Answer: (4)

JEE Main 2026 (Online) 22nd January Evening Shift

Keep practising — Classification of Elements and Periodicity in Properties

2

Which of the following represents the correct trend for the mentioned property? Choose the correct answer from the options given below :

  1. B and C only
  2. A, B and D only
  3. A and B only
  4. A, B, C and D
JEE Main 2026 (Online) 21st January Morning Shift
3

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 true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
JEE Main 2026 (Online) 21st January Evening Shift
4

The atomic number of the element from the following with lowest 1st ionisation enthalpy is :

  1. 32
  2. 35
  3. 19
  4. 87
JEE Main 2025 (Online) 8th April Evening Shift
5

Choose the incorrect trend in the atomic radii (r) of the elements.

  1. rRb < rCs
  2. rAt < rCs
  3. rBr < rK
  4. rMg < rAl
JEE Main 2025 (Online) 7th April Evening Shift
6

Which of the following statements are correct? Choose the correct answer from the options given below:

  1. A, C and D Only
  2. B and C Only
  3. B and D Only
  4. B, C and E Only
JEE Main 2025 (Online) 3rd April Morning Shift
7

Match the 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-IV, B-III, C-I, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-II, B-III, C-IV, D-I
JEE Main 2025 (Online) 3rd April Evening Shift
8

Electronic configuration of four elements A, B, C and D are given below: (A) 1s2 2s2 2p3 (B) 1s2 2s2 2p4 (C) 1s2 2s2 2p5 (D) 1s2 2s2 2p2 Which of the following is the correct order of increasing electronegativity (Pauling's scale)?

  1. D < A < B < C
  2. A < B < C < D
  3. A < C < B < D
  4. A < D < B < C
JEE Main 2025 (Online) 2nd April Evening Shift
9

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 incorrect but Statement II is correct
  2. Both Statement I and Statement II are correct
  3. Statement I is correct but Statement II is incorrect
  4. Both Statement I and Statement II are incorrect
JEE Main 2025 (Online) 29th January Morning Shift
10

The incorrect decreasing order of atomic radii is

  1. Si > P > Cl > F
  2. Mg > Al > C > O
  3. Al > B > N > F
  4. Be > Mg > Al > Si
JEE Main 2025 (Online) 28th January Morning Shift
11

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 false
  2. Statement I is false but Statement II is true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are true
JEE Main 2025 (Online) 28th January Evening Shift

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