JEE Chemistry

Trends in Atomic Radius & Ionisation Energy: JEE Questions & Solutions

30 previous-year JEE Chemistry questions on Trends in Atomic Radius & Ionisation Energy, each with a worked step-by-step solution.

Intermediate

Previous-year questions

  1. 01A p-block element E and hydrogen form a binary cation (EHₓ)⁺, while EH₃ on treatment with K₂HgI₄ in alkaline medium gives a precipitate of…MCQMediumJEE 2026
  2. 02Given below are two statements: Statement I: The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in…MCQMediumJEE 2026
  3. 03The correct trend in the first ionization enthalpies of the elements in the 3^rd period of periodic table is:MCQEasyJEE 2026
  4. 04Given below are two statements: Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of…MCQEasyJEE 2026
  5. 05The correct order of C, N, O and F in terms of second ionisation potential isMCQMediumJEE 2026
  6. 06In period 4 of the periodic table, the elements with highest and lowest atomic radii respectively are:MCQEasyJEE 2026
  7. 07Given below are the atomic numbers of some group 14 elements. The atomic number of the element with the lowest melting point is:MCQEasyJEE 2025
  8. 08The successive 5 ionisation energies of an element are 800 kJ/mol, 2427 kJ/mol, 3658 kJ/mol, 25024 kJ/mol and 32824 kJ/mol, respectively.…MCQEasyJEE 2025
  9. 09Given below are two statements: Statement (I): The first ionization energy of Pb is greater than that of Sn. Statement (II): The first…MCQEasyJEE 2025
  10. 10Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first…MCQMediumJEE 2025
  11. 11The incorrect decreasing order of atomic radii is:MCQEasyJEE 2025
  12. 12The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is:MCQEasyJEE 2025
  13. 13First ionisation enthalpy values of the first four group 15 elements are given below. Choose the correct value for the element that is a…MCQEasyJEE 2025
  14. 14The correct orders among the following are A. Atomic radius: B < Al < Ga < In < Tl B. Electronegativity: Al < Ga < In < Tl < B C. Density:…MCQMediumJEE 2025
  15. 15Given below are two statements: Statement (I): The first ionisation enthalpy of group 14 elements is higher than the corresponding elements…MCQEasyJEE 2025
  16. 16The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:MCQEasyJEE 2025
  17. 17Choose the incorrect trend in the atomic radii (r) of the elements:MCQEasyJEE 2025
  18. 18The atomic number of the element from the following with lowest 1^st ionization enthalpy is:MCQEasyJEE 2025
  19. 19Given below are two statements: Assertion A: The first ionisation enthalpy decreases across a period. Reason R: The increasing nuclear…MCQEasyJEE 2024
  20. 20The element having the highest first ionization enthalpy is:MCQEasyJEE 2024
  21. 21Given below are the two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R). Assertion (A): There is a…MCQMediumJEE 2024
  22. 22Match List-I with List-II: | List-I | List-II | |---|---| | A. Melting point (K) | I. Tl > In > Ga > Al > B | | B. Ionic Radius (M⁺³/pm) |…MCQMediumJEE 2024
  23. 23The correct order of hydration enthalpies is: (A) K⁺ (B) Rb⁺ (C) Mg²⁺ (D) Cs⁺ (E) Ca²⁺ Choose the correct answer from the options given…MCQEasyJEE 2023
  24. 24Given below are two statements: Statement I: The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.…MCQMediumJEE 2023
  25. 25The correct increasing order of the ionic radii is:MCQEasyJEE 2023
  26. 26Ion having the highest hydration enthalpy among the given alkaline earth metal ions is:MCQEasyJEE 2023
  27. 27Ion having highest hydration enthalpy among the given alkaline earth metal ions is:MCQEasyJEE 2023
  28. 28Given below are two statements: Statement I: Lithium and Magnesium do not form superoxide. Statement II: The ionic radius of Li⁺ is larger…MCQEasyJEE 2023
  29. 29Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The energy required to…MCQEasyJEE 2023
  30. 30For elements B, C, N, Li, Be, O and F, the correct order of first ionization enthalpy is:MCQEasyJEE 2023

Frequently asked questions

Our bank has 30 previous-year JEE Chemistry questions tagged to Trends in Atomic Radius & Ionisation Energy, drawn from JEE papers between 2023 and 2026, including 6 from 2026 alone. Each comes with a full step-by-step solution.

Trends in Atomic Radius & Ionisation Energy is rated Intermediate overall for JEE Chemistry. The PYQs on this page break down as 22 easy, 8 medium.

All 30 previous-year Trends in Atomic Radius & Ionisation Energy questions in our bank are multiple-choice (MCQ) questions.

Based on recent paper analysis, Trends in Atomic Radius & Ionisation Energy is worth about 2 marks in JEE Main. It sits in Classification of Elements & Periodicity, a Class 11 Chemistry chapter.

More Classification of Elements & Periodicity topics

Electron Gain Enthalpy & Electronegativity20Modern Periodic Table7Valency & Oxidation States7

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