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Classification of Elements and Periodicity in Properties · Question 3

RE-NEET (UG) 2026MCQEasy📈 Topic in 12% papers+4−1
1

Among the following options, the correct trend in the electron gain enthalpy is

  1. I > Br > Cl > F
  2. F > Cl > Br > I
  3. Br > Cl > F > I
  4. Cl > F > Br > I

Answer

(4) Cl > F > Br > I

Solution

Chlorine has a more negative electron gain enthalpy than fluorine due to the smaller size and high interelectronic repulsions in the compact 2p-subshell of fluorine.

The magnitude of negative electron gain enthalpy for halogens follows the order:

Cl > F > Br > I

Answer: (4)

RE-NEET (UG) 2026

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2

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.
RE-NEET (UG) 2026
3

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
4

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
5

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
6

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
7

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
8

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
9

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
10

The IUPAC name of an element with atomic number 119 is

  1. ununennium
  2. unnilennium
  3. unununnium
  4. ununoctium
NEET (UG) 2022
11

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)

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