JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 24 June 2022, Shift 1, Chemistry Q81

Question 81 of 90 in this shift, Chemistry question 21 of 30, Section B.

Atoms of element X form hcp lattice and those of element Y occupy

\frac{2}{3}

of its tetrahedral voids. The percentage of element X in the lattice is ______. (Nearest integer)

Official answer

NTA final key (2022 Session 1).

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

Same idea in other shifts

Asked 4× in all

26 Jun 2022, Shift 2 · Q82In a solid AB, A atoms are in ccp arrangement and B atoms occupy all the octahedral sites. If two atoms from the opposite faces are…MediumNumerical value
31 Aug 2021, Shift 2 · Q52The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites…EasyNumerical value
6 Sep 2020, Shift 2 · Q41A crystal is made up of metal ions 'M $_1$ ' and 'M $_2$ ' and oxide ions. Oxide ions form a ccp lattice structure. The cation 'M $_1$ '…MediumSingle 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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.