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Classification of Elements and Periodicity in Properties · Question 25

JEE Main 2025 (Online) 2nd April Evening ShiftMCQEasy📈 Topic in 6% papers+4−1
1

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)

JEE Main 2025 (Online) 2nd April Evening Shift

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2

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
3

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
4

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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