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Classification of Elements and Periodicity in Properties · Question 4

RE-NEET (UG) 2026MCQEasy📈 Topic in 50% papers+4−1
1

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. In light of the above statements, choose the most appropriate answer from the options given below:

  1. A is not correct but R is correct
  2. Both A and R are correct and R is the correct explanation of A
  3. Both A and R are correct and R is NOT the correct explanation of A
  4. A is correct but R is not correct.

Answer

(2) Both A and R are correct and R is the correct explanation of A

Solution

The electronic configuration of O is 1s2 2s2 2p4. Loss of one electron yields O+ with a stable half-filled 2p3 configuration. Moreover, pairing of electrons in one of the 2p orbitals of oxygen causes inter-electronic repulsions, making electron removal easier than from nitrogen (2p3) and fluorine (2p5). Thus, both Assertion and Reason are correct and Reason correctly explains Assertion. Answer: (2)

RE-NEET (UG) 2026

Keep practising — Classification of Elements and Periodicity in Properties

2

Which of the following statements are true? Choose the correct answer from the options given below :

  1. C and D only
  2. A, C, and E only
  3. A, B, and E only
  4. C and E only
NEET (UG) 2025
3

Which among the following electronic configurations belong to main group elements? Choose the correct answer from the option given below :

  1. D and E only
  2. A, C and D only
  3. B and E only
  4. A and C only
NEET (UG) 2025
4

Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N Choose the correct answer from the options given below:

  1. Li < Be < B < C < N
  2. Li < B < Be < C < N
  3. Li < Be < C < B < N
  4. Li < Be < N < B < C
NEET (UG) 2024
5

Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si Choose the correct answer from the options given below :

  1. Si < C < N < O < F
  2. Si < C < O < N < F
  3. O < F < N < C < Si
  4. F < O < N < C < Si
NEET (UG) 2024
6

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is

  1. Be > Li > B > C
  2. Li > Be > B > C
  3. C > B > Be > Li
  4. Li > C > Be > B
RE-NEET (UG) 2024
7

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

  1. A-I, B-II, C-IV, D-III
  2. A-I, B-IV, C-III, D-II
  3. A-I, B-IV, C-II, D-III
  4. A-IV, B-I, C-II, D-III
RE-NEET (UG) 2024
8

The element expected to form largest ion to achieve the nearest noble gas configuration is

  1. F
  2. N
  3. Na
  4. O
NEET (UG) 2023
9

The IUPAC name of an element with atomic number 119 is

  1. ununennium
  2. unnilennium
  3. unununnium
  4. ununoctium
NEET (UG) 2022
10

The correct order of first ionization enthalpy for the given four elements is :

  1. C < F < N < O
  2. C < N < F < O
  3. C < N < O < F
  4. C < O < N < F
NEET (UG) 2022 (Phase 2)
11

If first ionization enthalpies of elements X and Y are 419 kJ mol-1 and 590 kJ mol-1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol-1 and 1145 kJ mol-1, respectively. Then correct statement is :

  1. Both X and Y are alkaline earth metals
  2. X is an alkali metal and Y is an alkaline earth metal
  3. X is an alkaline earth metal and Y is an alkali metal
  4. Both X and Y are alkali metals
NEET (UG) 2022 (Phase 2)

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