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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 31 January 2024, Shift 2, Chemistry Q66

Question 66 of 90 in this shift, Chemistry question 6 of 30, Section A.

Consider the following elements. Group ↓\downarrow A' B' →\rightarrow Period C' D' Which of the following is/are true about A', B', C' and D'? A. Order of atomic radii: B' < A' < D' < C' B. Order of metallic character: B' < A' < D' < C' C. Size of the element: D' < C' < B' < A' D. Order of ionic radii: B′+<A′+<D′+<C′+\mathrm{B'^+ < A'^+ < D'^+ < C'^+} Choose the correct answer from the options given below :

The figure, in words

Periodic-table fragment: a 2x2 block with A' and B' in the top row and C' and D' in the bottom row; an arrow labelled Group points downward and an arrow labelled Period points to the right along the top row.
  1. (1)A, B and D onlyOfficial answer
  2. (2)A and B only
  3. (3)B, C and D only
  4. (4)A only

Official answer

Option 1

NTA final key.

Chapter
Classification of Elements and Periodicity in Properties
Topic
Periodic Trends
Idea tested
Atomic and Ionic Radii Trends

Same idea in other shifts

Asked 3× in all
  1. 7 Apr 2025, Shift 2 · Q59Choose the incorrect trend in the atomic radii (r) of the elements.EasySingle correct
  2. 2 Sep 2020, Shift 1 · Q32In general, the property (magnitudes only) that shows an opposite trend in comparison to other properties across a period is :EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.