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Classification of Elements and Periodicity in Properties

JEE Main 2025 (Online) 22nd January Morning ShiftMCQMedium📈 Topic in 5% papers+4−1
Ques. 1JEE 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

Answer

(3) Al<Mg<B<N

Solution

Mg (1.31) < Al (1.61), so "Al<Mg" is wrong.

Al<Mg<B<N is incorrect (correct: Mg<Al<B<N); the other orders rise correctly.

Answer: (3)

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Ques. 2JEE Main 2025, 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. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 3JEE Main 2024, 8 April (Morning Shift)

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

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

Identify the correct statements about p-block elements and their compounds. Choose the correct answer from the options given below :

  1. (B) and (D) only
  2. (B) and (E) only
  3. (D) and (E) only
  4. (A) and (C) only
Ques. 5JEE Main 2024, 6 April (Morning Shift)

The electron affinity values are negative for Choose the most appropriate answer from the options given below :

  1. A, B, D and E only
  2. D and E only
  3. A and D only
  4. A, B and C only
Ques. 6JEE Main 2024, 5 April (Morning Shift)

The statement(s) that are correct about the species O2-, F-, Na+ and Mg2+. Choose the most appropriate answer from the options given below :

  1. C and D only
  2. A, C and D only
  3. B, C and D only
  4. A, B, C and D
Ques. 7JEE Main 2024, 5 April (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 true
  2. Statement I is incorrect but Statement II is true
  3. Both Statement I and Statement II are false
  4. Statement I is correct but Statement II is false
Ques. 8JEE Main 2024, 4 April (Morning Shift)

The correct order of first ionization enthalpy values of the following elements is : Choose the correct answer from the options given below :

  1. A < B < D < C < E
  2. C < E < A < B < D
  3. E < C < A < B < D
  4. B < D < C < E < A
Ques. 9JEE Main 2024, 4 April (Morning Shift)

Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is . B, C, N, S, O, F, P, Al, Si

  1. 7
  2. 3
  3. 5
  4. 6
Ques. 10JEE Main 2024, 4 April (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 false
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are true
Ques. 11JEE Main 2024, 1 February (Morning Shift)

In case of isoelectronic species the size of F-, Ne and Na+ is affected by :

  1. Nuclear charge (Z)
  2. None of the factors because their size is the same
  3. Electron-electron interaction in the outer orbitals
  4. Principal quantum number (n)

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