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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 9 April 2024, Shift 1, Chemistry Q68

Question 68 of 90 in this shift, Chemistry question 8 of 30, Section A.

The electronic configuration of Cu(II) is 3d93d^9 whereas that of Cu(I) is 3d103d^{10}. Which of the following is correct ?
  1. (1)Cu(II) is more stableOfficial answer
  2. (2)Cu(II) is less stable
  3. (3)Cu(I) and Cu(II) are equally stable
  4. (4)Stability of Cu(I) and Cu(II) depends on nature of copper salts

Official answer

Option 1

NTA final key.

Chapter
The d- and f-Block Elements
Topic
d-Block Elements
Idea tested
Aqueous Stability of Cu+ vs Cu2+

Same idea in other shifts

Asked 2× in all
  1. 27 Jun 2022, Shift 1 · Q87The number of statement(s) correct from the following for Copper (at. no. 29) is/are __________. (A) Cu(II) complexes are always…MediumNumerical value

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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.