JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 22 July 2021, Shift 2, Chemistry Q52

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

A copper complex crystallising in a CCP lattice with a cell edge of 0.4518 nm has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be 7.62 g cm

^{-3}

. The molar mass of copper complex is ________ g mol

^{-1}

. (Nearest integer) [Given :

\mathrm{N_A}

6.022 \times 10^{23}

mol

^{-1}

]

Official answer

106

NTA final key.

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

Same idea in other shifts

Asked 9× in all

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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
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.