JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 18 March 2021, Shift 1, Chemistry Q31

Question 31 of 90 in this shift, Chemistry question 1 of 30, Section A.

In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is :

(1) $\mathrm{M_2A_3}$
(2) $\mathrm{M_4A_3}$ Official answer
(3) $\mathrm{MA_3}$
(4) $\mathrm{M_4A}$

Official answer

Option 2

NTA final key.

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

Same topic in other shifts

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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 42 of the 174 JEE Main shifts held from 2017 to 2026.