Chemistry · Solid State

NEET (UG) 2023 — Question 73

What fraction of one edge centred octahedral void lies in one unit cell of fcc?

Option A:
$\frac{1}{3}$
Option B:
$\frac{1}{4}$
Correct
Option C:
$\frac{1}{12}$
Option D:
$\frac{1}{2}$

Answer: B

Step-by-step solution

The total number of octahedral voids in FCC are four Octahedral voids in FCC = Edge centres + Body centre The contribution of edge centre $=\frac{1}{4}$ $\therefore \quad$ Fraction of one edge centred octahedral void in one unit cell of FCC $=\frac{1}{4}$

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Exam: NEET (UG) 2023
Paper: 2023 paper
Subject: Chemistry
Chapter: Solid State
Topic: Types of Crystal Packing: SC, BCC, FCC, Hexagonal

A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy 1 / 3 of tetrahedral…

Answer: B

Step-by-step solution

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