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Classification of Elements and Periodicity in Properties

JEE Main 2026 (Online) 22nd January Evening ShiftMCQMedium📈 Topic in 32% papers+4−1
Ques. 1JEE Main 2026, 22 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. 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: the first ionization enthalpies ( kJ mol-1) are C 1086, N 1402, O 1314 and F 1681.

N has the extra-stable half-filled 2p3 configuration, its ionization enthalpy is higher than that of O, so the order is C < O < N < F and Statement I is true.

Statement II: the electron gain enthalpies ( kJ mol-1) are O −141, S −200, Se −195, Te −190 and 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.

Thus the order of magnitude is S > Se > Te > Po > O, and Statement II is true.

Answer: (4)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE Main 2026, 21 January (Morning Shift)

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
Ques. 3JEE Main 2026, 21 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 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
Ques. 4JEE Main 2025, 8 April (Evening Shift)

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

  1. 32
  2. 35
  3. 19
  4. 87
Ques. 5JEE Main 2025, 7 April (Evening Shift)

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

  1. rRb < rCs
  2. rAt < rCs
  3. rBr < rK
  4. rMg < rAl
Ques. 6JEE Main 2025, 3 April (Morning Shift)

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
Ques. 7JEE Main 2025, 3 April (Evening Shift)

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
Ques. 8JEE Main 2025, 2 April (Evening Shift)

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
Ques. 9JEE Main 2025, 29 January (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 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
Ques. 10JEE Main 2025, 29 January (Evening Shift)

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is :

  1. AO
  2. AO2
  3. A2O
  4. A2O3
Ques. 11JEE Main 2025, 29 January (Evening Shift)

First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :

  1. 834 kJ mol-1
  2. 947 kJ mol-1
  3. 1402 kJ mol-1
  4. 1012 kJ mol-1

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