JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 28 July 2022, Shift 2, Chemistry Q52

Question 52 of 90 in this shift, Chemistry question 22 of 30, Section B.

Metal M crystallizes into a fcc lattice with the edge length of

4.0\times10^{-8}

cm. The atomic mass of the metal is ______ g/mol. (Nearest integer) (Use :

\mathrm{N_A}=6.02\times10^{23}\ \mathrm{mol^{-1}}

, density of metal, M

=9.03\mathrm{g\ cm^{-3}}

)

Official answer

NTA final key.

Chapter: The Solid State
Topic: Crystal Lattices
Idea tested: Unit Cell Density

Same idea in other shifts

Asked 9× in all

11 Apr 2023, Shift 1 · Q82An atomic substance A of molar mass $12\ \mathrm{g\ mol^{-1}}$ has a cubic crystal structure with edge length of 300 pm. The no. of atoms…MediumNumerical value
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
25 Jun 2022, Shift 1 · Q82The distance between $\mathrm{Na^+}$ and $\mathrm{Cl^-}$ ions in solid NaCl of density $43.1\ \mathrm{g\ cm^{-3}}$ is __________…MediumNumerical value
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 $^{-3}$ . The number…MediumSingle correct
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
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
3 Sep 2020, Shift 1 · Q47An element with molar mass $2.7\times10^{-2}$ $\mathrm{kg\ mol^{-1}}$ forms a cubic unit cell with edge length 405 pm. If its density is…MediumNumerical value
5 Sep 2020, Shift 1 · Q40A diatomic molecule $\mathrm{X_2}$ has a body-centred cubic (bcc) structure with a cell edge of 300 pm. The density of the molecule is…MediumSingle correct

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.