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JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 16 March 2021, Shift 2, Chemistry Q52

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

Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is ________

\times10^{21}

. (Round off to the Nearest Integer). [Given :

N_A=6.023\times10^{23}

]

Official answer

15

NTA final key.

Chapter: The Solid State
Topic: Crystal Lattices
Idea tested: Tetrahedral and Octahedral

Same idea in other shifts

Asked 2× in all

26 Feb 2021, Shift 2 · Q52The number of octahedral voids per lattice site in a lattice is __________. (Rounded off to the nearest integer)EasyNumerical 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 108 of the 174 JEE Main shifts held from 2017 to 2026.