Which is covalent solid?

(a) Fe2O3

(b) Diamond

(c) Graphite 

(d) All of these

Concept Questions :-

Introduction and Type of Crystal System
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What type of crystal defects is indicated in the diagram given below?

(a) Frenkel and Schottky defects
(b) Schottky defect
(c) Interstitial defect
(d) Frenkel defect

Concept Questions :-

Imperfections in Solids
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The anions (A) form hexagonal closest packing and atoms (C) occupy only 2/3 of octahedral voids in
it. then the general formula of the compound is-

(A) CA

(B) A2

(C) C2A3

(D) C3A2

Concept Questions :-

Density/Formula/packing fraction/ Semiconductors
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The mass of a unit cell of CsCl corresponds to:-

1. 8Cs+ and Cl-

2. 1Cs+ and 6Cl-

3. 1Cs+ and 1Cl-

4. 4Cs+ and Cl-

Concept Questions :-

Introduction and Type of Crystal System
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Graphite in an example of-

(A) Ionic solid

(B) Covalent solid

(C) Vander waal's crystal

(D) Metallic crystal

Concept Questions :-

Introduction and Type of Crystal System
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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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