Which is covalent solid?

(1) Fe2O3

(2) Diamond

(3) Graphite 

(4) All of these

Subtopic:  Introduction & Crystal System |
 89%
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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-

(1) CA

(2) A2

(3) C2A3

(4) C3A2

Subtopic:  Density & Packing Fraction |
 82%
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Graphite in an example of-

(1) Ionic solid

(2) Covalent solid

(3) Vander waal's crystal

(4) Metallic crystal

Subtopic:  Introduction & Crystal System |
 95%
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Select the correct statement (s)-

(a) The C.N. of cation occupying a tetrahedral hole is 4.

(b) The C.N. of cation occupying a octahedral hole is 6.

(c) In schottky defects, density of the lattice decreases,

(A) a,b

(B) b,c

(C) a,b,c

(D) a,c

Subtopic:  Voids, Radius Ratio & Coordination Number |
 80%
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Which arrangement of electrons leads to anti-ferromagnetism?
(1)  ↑↑↑↑
(2)  ↑↓↑↓
(3) Both (a) and (b)
(4) None of these

Subtopic:  Magnetic Behaviour of an Element/Compound |
 86%
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Among the following types of voids. which one is the largest void:-

(A) Triangular system
(B) Tetragonal system
(C) Monoclinic system
(D) Octahedral

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number | Magnetic Behaviour of an Element/Compound |
 77%
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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

Subtopic:  Voids, Radius Ratio & Coordination Number |
 84%
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The most efficient packing of similar spheres is obtained in 

1. the simple cubic system and the body centered cubic system

2. the simple cubic system and the hexagonal close packed system

3. the face centered cubic system and the hexagonal close packed system

4. the body centered cubic system and the face centered cubic system

Subtopic:  Density & Packing Fraction |
 79%
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Frenkel defect is noticed in:

(a) AgBr

(b) ZnS

(c) Agl

(d) all of these

Subtopic:  Imperfections in Solids & Semiconductors |
 91%
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How many octahedral and tetrahedral holes are present per unit cell in a face centred cubic arrangement of atoms?

(1) 8,4

(2) 1.2

(3) 4.8

(4) 2.1

Subtopic:  Introduction & Crystal System |
 80%
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