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Classification of Elements and Periodicity in Properties

JEE Main 2025 (Online) 2nd April Evening ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE 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

Answer

(1) D < A < B < C

Solution

Identify the elements from their configurations:

A (2p3) = N, B (2p4) = O, C (2p5) = F, D (2p2) = C

All are in period 2; electronegativity increases from left to right as the nuclear charge increases and the atomic size decreases.

Pauling values: C (2.5) < N (3.0) < O (3.5) < F (4.0)

D < A < B < C

Answer: (1)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE 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. 3JEE 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. 4JEE 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
Ques. 5JEE Main 2025, 28 January (Morning Shift)

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
Ques. 6JEE Main 2025, 28 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
Ques. 7JEE Main 2025, 24 January (Morning Shift)

Which of the following statements are NOT true about the periodic table? Choose the correct answer from the options given below:

  1. A, C and E Only
  2. A and E Only
  3. B, C and E Only
  4. D and E Only
Ques. 8JEE Main 2025, 24 January (Evening Shift)

The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present :

  1. Group 4
  2. Group 2
  3. Group 13
  4. Group 14
Ques. 9JEE Main 2025, 23 January (Morning Shift)

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

  1. Platinum
  2. Osmium
  3. Iridium
  4. Palladium
Ques. 10JEE Main 2025, 22 January (Morning Shift)

Match List-I with List-II.

  1. A-IV, B-I, C-II, D-III
  2. A-III, B-IV, C-II, D-I
  3. A-II, B-III, C-IV, D-I
  4. A-IV, B-I, C-III, D-II
Ques. 11JEE Main 2025, 22 January (Morning Shift)

Which of the following electronegativity order is incorrect?

  1. S<Cl<O<F
  2. Al<Si<C<N
  3. Al<Mg<B<N
  4. Mg<Be<B<N

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