Atomos Test Generator Free PYQs ExamsMy practice Log in / Sign up free

Classification of Elements and Periodicity in Properties

JEE Main 2026 (Online) 6th April Evening ShiftMCQEasy📈 Topic in 32% papers+4−1
Ques. 1JEE Main 2026, 6 April (Evening Shift)

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

Answer

(3) lowest and highest

Solution

At the extreme left of a period is an alkali metal, with one electron outside a noble-gas core and the largest atom of the period, so it has the lowest first ionisation enthalpy in the period.

At the extreme right (except the noble gas) is a halogen, which needs only one electron to complete its octet and has small size and high Zeff, so it has the most negative, i.e. the highest negative, electron gain enthalpy.

∴ The values are lowest and highest respectively.

Answer: (3)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE Main 2026, 5 April (Morning Shift)

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
Ques. 3JEE Main 2026, 5 April (Evening Shift)

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
Ques. 4JEE Main 2026, 4 April (Morning Shift)

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
Ques. 5JEE Main 2026, 4 April (Evening Shift)

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
Ques. 6JEE Main 2026, 2 April (Morning Shift)

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
Ques. 7JEE Main 2026, 2 April (Evening Shift)

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
Ques. 8JEE Main 2026, 2 April (Evening Shift)

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
Ques. 9JEE Main 2026, 28 January (Morning Shift)

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
Ques. 10JEE Main 2026, 28 January (Evening Shift)

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

  1. 7 and 5
  2. 6 and 7
  3. 5 and 7
  4. 5 and 6
Ques. 11JEE Main 2026, 24 January (Morning Shift)

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

All Classification of Elements and Periodicity in Properties PYQs →

PDFDownload Classification of Elements and Periodicity in Properties PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structures-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry