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Classification of Elements and Periodicity in Properties · Question 1

JEE Main 2026 (Online) 8th April Evening ShiftMatchingEasy📈 Topic in 42% papers+4−1
1

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

  1. A-II, B-III, C-IV, D-I
  2. A-IV, B-III, C-II, D-I
  3. A-III, B-II, C-IV, D-I
  4. A-III, B-II, C-I, D-IV

Answer

(1) A-II, B-III, C-IV, D-I

Solution

With n = 2: A. 2s2 → Be; B. 2s22p1 → B; C. 2s22p3 → N; D. 2s22p6 → Ne

Ne has a stable noble-gas configuration ⇒ highest value ⇒ D-I (2080)

N has a stable half-filled 2p subshell ⇒ C-IV (1402)

Be (2s2, fully filled, penetrating 2s electron) has a higher value than B (2p electron, shielded by 2s electrons) ⇒ A-II (899), B-III (800)

∴ A-II, B-III, C-IV, D-I

Answer: (1)

JEE Main 2026 (Online) 8th April Evening Shift

Keep practising — Classification of Elements and Periodicity in Properties

2

First and second ionization enthalpies of lithium are 520 kJ mol-1 and 7297 kJ mol-1 respectively. Energy required to convert 3.5 mg lithium (g) into Li2+(g) [ Li(g) Li2+(g)] is kJ. (nearest integer) [Molar mass of Li = 7 g mol-1]

JEE Main 2026 (Online) 6th April Morning Shift
3

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

  1. lowest and lowest
  2. highest and lowest
  3. lowest and highest
  4. highest and highest
JEE Main 2026 (Online) 6th April Evening 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 true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 5th April Morning Shift
5

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 true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 5th April Evening Shift
6

A monoatomic anion (A-) has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are

  1. 80, 17, liquid
  2. 81, 16, solid
  3. 80, 16, gas
  4. 81, 15, gas
JEE Main 2026 (Online) 4th April Morning Shift
7

The 1st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2nd ionization enthalpy of Mg is .

  1. −906 kJ/mol
  2. −856 kJ/mol
  3. +1450 kJ/mol
  4. +590 kJ/mol
JEE Main 2026 (Online) 4th April Evening Shift
8

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 true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 2nd April Morning Shift
9

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is :

  1. Na2O, K2O, Al2O3 and As2O3
  2. Al2O3, As2O3, CO and NO
  3. K2O, Cl2O7, As2O3 and NO
  4. Na2O, N2O, Al2O3 and CO
JEE Main 2026 (Online) 2nd April Evening Shift
10

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 true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 2nd April Evening Shift
11

In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.

  1. Rb & Br
  2. Na & Cl
  3. K & Br
  4. K & Se
JEE Main 2026 (Online) 28th January Morning Shift

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