CsCl crystallises in body-centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct?

(a) rCs+ + rCl- = 3a

(b)  rCs+ + rCl- = 3a/2

(c)  rCs+ + rCl- = (3/2)*a

(d) rCs+ + rCl-3a

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Introduction and Type of Crystal System
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In an f.c.c. unit cell. atoms are numbered as shown below.The atoms not touching each other are (Atom numbered 3 is face centre of front face).

(A) 3&4
(B) 1&3
(C) 1&2
(D) 2&4

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Which is covalent solid?

(a) Fe2O3

(b) Diamond

(c) Graphite 

(d) All of these

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The mass of a unit cell of CsCl corresponds to:-

(a)8Cs+ and Cl-

(b)1Cs+ and 6Cl-

(c)1Cs+ and 1Cl-

(d)4Cs+ and Cl-

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Graphite in an example of-

(A) Ionic solid

(B) Covalent solid

(C) Vander waal's crystal

(D) Metallic crystal

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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

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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

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TiO2 is well known example of:

(a) triclinic system

(b) tetragonal system

(c) monoclinic system

(d) none of these

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Which pairs shows isomorphism?
(a) KNO3, NaNO3 
(b) Cr2O3, FeO
(c) Both (a) and (b)
(d) Ferrimagnetic

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Introduction and Type of Crystal System
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The elements of symmetry in a crystal are:-
(a) plane of symmetry
(b) axis of symmetry
(c) centre of symmetry
(d) all of these

Concept Questions :-

Introduction and Type of Crystal System
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