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Classification of Elements and Periodicity in Properties

JEE Main 2025 (Online) 3rd April Morning ShiftMCQMedium📈 Topic in 9% papers+4−1
Ques. 1JEE 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

Answer

(2) B and C Only

Solution

A. Incorrect. Adding an electron is not always exothermic: for noble gases (and for atoms such as Be and N) energy has to be supplied, i.e. egH is positive.

B. Correct. Energy is always required to remove an electron from an isolated gaseous atom, so ionisation is always endothermic.

C. Correct. B (2s2 2p1): the 2p electron is shielded by the 2s electrons and is removed more easily than a 2s electron of Be (2s2).

i H1: B (801 kJ mol-1) < Be (899 kJ mol-1)

D. Incorrect. As per NCERT, the electronegativity of an element is not constant; it varies with the atom to which it is bonded. C bonded to four Cl atoms in CCl4 is more electronegative than C in CH4.

E. Incorrect. Electropositive character increases down group 1; Li is the least electropositive alkali metal (Cs is the most electropositive among the stable ones).

Correct statements: B and C only

Answer: (2)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE 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. 3JEE 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. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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

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