Which arrangement of electrons leads to anti-ferromagnetism?
(a)  ↑↑↑↑
(b)  ↑↓↑↓
(c) Both (a) and (b)
(d) None of these

Concept Questions :-

Magnetic Behaviour of an Element/Compound
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The intermetallic compound LiAg has a cubic crystalline structure in which each Li atom has 8 nearest neighbour silver atoms and vice-versa. What is the type of unit cell?

1. Body centred cubic

2. Face centred cubic

3. Simple cubic for either Li atoms alone or Ag atoms alone

4. None of the above

Concept Questions :-

Introduction and Type of Crystal System
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The arrangement ABC ABC.. is referred to as.

1. octahedral close packing

2. hexagonal clase packing

3. tetrahedral close packing

4. cubic close packing

Concept Questions :-

Voids and radius ratio/coordination number
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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

Concept Questions :-

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

Concept Questions :-

Voids and radius ratio/coordination number
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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

Concept Questions :-

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

Concept Questions :-

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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