An ionic compound A_x B_y crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of A_xB_y is ________.

(a)

AB

(b)

AB₃

(c)

A₃B

(d)

A₈B₆

Solid CO₂ is an example of ________.

(a)

Covalent solid

(b)

metallic solid

(c)

molecular solid

(d)

ionic solid

The composition of a sample of wurtzite is Fe_0.93 O_1.00 what % of Iron present in the form of Fe³⁺?

(a)

16.05%

(b)

15.05%

(c)

18.05%

(d)

17.05%

CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is ________.

(a)

400pm

(b)

800pm

(c)

\(\sqrt { 3 } \times 100pm\)

(d)

\(\left( \frac { \sqrt { 3 } }{ 2 } \right) \times 400pm\)

The fraction of total volume occupied by the atoms in a simple cubic is ________.

(a)

\(\left( \frac { \pi }{ 4\sqrt { 2 } } \right) \)

(b)

\(\left( \frac { \pi }{ 6 } \right) \)

(c)

\(\left( \frac { \pi }{ 4 } \right) \)

(d)

\(\left( \frac { \pi }{ 3\sqrt { 2 } } \right) \)

If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.

(a)

\(\left( \frac { 1 }{ 2 } a;\frac { \sqrt { 3 } }{ 2 } a;\frac { \sqrt { 2 } }{ 2 } a \right) \)

(b)

\(\left( \sqrt { 1a } :\sqrt { 3a } :\sqrt { 2a } \right) \)

(c)

\(\left( \frac { 1 }{ 2 } a:\frac { \sqrt { 3 } }{ 4 } a:\frac { 1 }{ 2\sqrt { 2 } } a \right) \)

(d)

\(\frac { 1 }{ 2 } a:\sqrt { 3 } a:\frac { 1 }{ \sqrt { 2 } } a\)

The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as _____.

(a)

Schottky defect

(b)

F center

(c)

Frenkel defect

(d)

non-stoichiometric defect

The crystal with a metal deficiency defect is ________.

(a)

NaCl

(b)

FeO

(c)

ZnO

(d)

KCl

In which of the following arrangements, octahedral voids are formed?

(a)

fcc

(b)

bcc

(c)

simple cubic

(d)

hcp

Which of the following is characteristic of ionic solids?

(a)

Very low value of electrical conductivity in the molten state

(b)

Brittie nature

(c)

Very strong forces of attractions

(d)

Anisotropic nature

What is the relation between diamond and graphite?

(a)

Polymorphous

(b)

Isomer

(c)

Isotope

(d)

Isomorphous

A binary solid A+B has a structure with B^- ions constituting the lattice and A⁺ ions occupying 25% tetrahedral holes. Formula of the solid is _______.

(a)

A₂B

(b)

AB₂

(c)

AB

(d)

AB₄

Which one of the following crystal has 8 : 8 structure?

(a)

MgF₂

(b)

CsCl

(c)

KCl

(d)

NaCl

Which type of solids will have the highest melting point?

(a)

Ionic crystals

(b)

Network covalent solid

(c)

Molecular solids

(d)

Metallic crystals

Three atoms P, Q and R crystallize in a cubic solid lattice having P atom at corners Q atom at body centre and R atom at the face centres. Identify formula of the compound _______.

(a)

PQR

(b)

PQR₂

(c)

PQR₃

(d)

P₃QR

The force that binds a metal ion to a number of electrons within its sphere of influence is known as_________ bond.

(a)

covalent

(b)

ionic

(c)

metallic

(d)

co-ordinate

In edge centred lattice, an atom in the edge is shared by________.

(a)

4 unit cell

(b)

12 unit cell

(c)

2 unit cell

(d)

8 unit cell

The size of the anion in Frenkel defect crystal is_______.

(a)

larger than the cation

(b)

smaller than the cation

(c)

equal in size with cation

(d)

both are larger in size

ABAB type of packing is called _________.

(a)

hexagonal close packing

(b)

cubic close packing

(c)

tetragonal close packing

(d)

none of the above

The coordination number of each sphere in body centred cubic packing is _______.

(a)

2

(b)

4

(c)

6

(d)

8