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Classification of Elements and Periodicity in Properties · Question 23

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

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)

JEE Main 2025 (Online) 3rd April Morning Shift

Keep practising — Classification of Elements and Periodicity in Properties

2

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
3

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
4

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
5

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
6

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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