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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 6 September 2020, Shift 2, Chemistry Q41

Question 41 of 75 in this shift, Chemistry question 16 of 25.

A crystal is made up of metal ions 'M1_1' and 'M2_2' and oxide ions. Oxide ions form a ccp lattice structure. The cation 'M1_1' occupies 50% of octahedral voids and the cation 'M2_2' occupies 12.5% of tetrahedral voids of oxide lattice. The oxidation numbers of 'M1_1' and 'M2_2' are, respectively :
  1. (1)+2,+4+2, +4Official answer
  2. (2)+4,+2+4, +2
  3. (3)+1,+3+1, +3
  4. (4)+3,+1+3, +1

Official answer

Option 1

NTA final key (Sep 2020).

Chapter
The Solid State
Topic
Crystal Lattices
Idea tested
Empirical Formula from Void Occupancy

Same idea in other shifts

Asked 2× in all
  1. 24 Jun 2022, Shift 1 · Q81Atoms of element X form hcp lattice and those of element Y occupy 23\frac{2}{3} of its tetrahedral voids. The percentage of element X in…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 42 of the 174 JEE Main shifts held from 2017 to 2026.