The arrangement ABC ABC.. is referred to as.

1. octahedral close packing

2. hexagonal clase packing

3. tetrahedral close packing

4. cubic close packing

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How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.00g?

[ Atomic masses Na=23, Cl = 35.5]

(a) 2.57 x 1021

(b) 5.14 x 1021

(c) 1.28 x 1021

(d) 1.71 x 1021

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Density/Formula/packing fraction/ Semiconductors
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The ratio of cations to anion in a closed pack tetrahedral is:

(a) 0.714
(b) 0.225
(c) 0.02
(d) none of these

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In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be :-

(a) X3Y4
(b)X4Y3
(c) X2Y3
(d) X2Y

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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A spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in ccp layers. The normal spinel has 1/8th of the tetrahedral void occupied  by one type of metal and one half of the octahedral voids occupied by another type of metal ions. Such a spinel is formed by Zn2+, Al3+ and O2- with Zn2+ in tetrahedral void. Give the simplest formula of the spinel.

(A) ZnAl2O4

(B) ZnAl2O3

(C) ZnAlO

(D) None of these

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Magnetic Behaviour of an Element/Compound
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Close packing is maximum in the crystal lattice of:

(a) simple cubic
(b) face centred
(c) body centred
(d) none of these

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Frenkel defect is noticed in:

(a) AgBr

(b) ZnS

(c) Agl

(d) all of these

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Imperfections in Solids
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The density of KCl is 1.9893 g cm-3 and the length of a side unit cell is 6.29082 Å as determined by X-rays diffraction. The value of Avogadro’s number calculated from these data is:-

1. 6.017 x 1023

2. 6.023 x 1023

3. 6.03 x 1023

4. 6.017 x 1019

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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Difficulty Level:

How many octahedral and tetrahedral holes are present per unit cell in a face centred cubic arrangement of atoms?

(A) 8,4

(B) 1.2

(C) 4.8

(D) 2.1

Concept Questions :-

Introduction and Type of Crystal System
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Difficulty Level:

TiO2 is well known example of:

(a) triclinic system

(b) tetragonal system

(c) monoclinic system

(d) none of these

Concept Questions :-

Introduction and Type of Crystal System