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Saturday, 31 October

JEE Main · Chemistry · The Solid State

Unit Cell Density

JEE Main asked Unit Cell Density 9 times in 9 of the 108 shifts Lumi analysed, in 2020, 2021, 2022 and 2023. It belongs to Crystal Lattices, in The Solid State (Chemistry). The longest wait between two years asking it was 1 year. In 2020, 2021 and 2022 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
9
in 9 shifts
Years
4 of 8
First asked
2020
last in 2023
Pattern
Comes in cycles
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022 and 2023. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.10.20’170.17’200.07’210.14’220.07’230’240’250’26

Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 2 in 24 shifts · 2022: 4 in 24 shifts · 2023: 1 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20260 of 9
  • 20250 of 8
  • 20240 of 18
  • 20231 of 12
  • 20224 of 24
  • 20212 of 24
  • 20202 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Atoms per unit cell from density
  • Atoms in sample from unit cell data

Difficulty

Easy 1Medium 8Hard 0

7 of the 9 questions had a numerical answer.

Every question

All 9 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 11 Apr 2023, Shift 1 · Q82An atomic substance A of molar mass 12 g mol−112\ \mathrm{g\ mol^{-1}} has a cubic crystal structure with edge length of 300 pm. The no. of atoms…MediumNumerical value
  2. 30 Jun 2022, Shift 1 · Q61An element X has a body centred cubic (bcc) structure with a cell edge of 200 pm. The density of the element is 5 g cm−3^{-3}. The number…MediumSingle correct
  3. 25 Jun 2022, Shift 1 · Q82The distance between Na+\mathrm{Na^+} and Cl−\mathrm{Cl^-} ions in solid NaCl of density 43.1 g cm−343.1\ \mathrm{g\ cm^{-3}} is __________…MediumNumerical value
  4. 28 Jul 2022, Shift 2 · Q52Metal M crystallizes into a fcc lattice with the edge length of 4.0×10−84.0\times10^{-8} cm. The atomic mass of the metal is ______ g/mol.…EasyNumerical value
  5. 28 Jul 2022, Shift 1 · Q82An element M crystallises in a body centred cubic unit cell with a cell edge of 300 pm. The density of the element is…MediumNumerical value
  6. 22 Jul 2021, Shift 2 · Q52A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies.…MediumNumerical value
  7. 25 Feb 2021, Shift 2 · Q52The unit cell of copper corresponds to a face centered cube of edge length 3.596 Å with one copper atom at each lattice point. The…MediumNumerical value
  8. 5 Sep 2020, Shift 1 · Q40A diatomic molecule X2\mathrm{X_2} has a body-centred cubic (bcc) structure with a cell edge of 300 pm. The density of the molecule is…MediumSingle correct
  9. 3 Sep 2020, Shift 1 · Q47An element with molar mass 2.7×10−22.7\times10^{-2} kg mol−1\mathrm{kg\ mol^{-1}} forms a cubic unit cell with edge length 405 pm. If its density is…MediumNumerical value

Shifts: 3 Sep 2020, Shift 1, 5 Sep 2020, Shift 1, 25 Feb 2021, Shift 2, 22 Jul 2021, Shift 2, 25 Jun 2022, Shift 1, 30 Jun 2022, Shift 1, 28 Jul 2022, Shift 2, 28 Jul 2022, Shift 1, 11 Apr 2023, Shift 1.

Same topic

Other ideas in Crystal Lattices

Crystal Lattices has 9 ideas JEE Main has asked; 4 of them came up in more than one question.

Topic analysisChapter analysisAll repeated ideas