solid state

Question 1

_____ keep(s) molecular far

Answer 1

thermal e

Question 2

nacl & quartz are _ solids

Answer 2

true

Question 3

SiO2 on heating and cooling (rapidly) becomes _ and on crystallising becomes _

Answer 3

quartz glass, quartz

Question 4

where is the valence e present in lattice of graphite

Answer 4

between diff layers

Question 5

rank of bcc, ecc, fcc respectively

Answer 5

2, 2, 4

Question 6

which of the 7 lattices have a=b=c?

Answer 6

cubic, rhombohedral/trigonal

Question 7

which of the 7 lattices have all angles equal?

Answer 7

cubic, tetragonal, orthorhombic

Question 8

which of the 7 lattices has neither any sides nor any angles equal?

Answer 8

triclinic

Question 9

which of the 7 lattices has all sides unequal

Answer 9

monoclinic

Question 10

all 7 lattices and the relationship between their sides and angles

Answer 10

.

Question 11

CN of 3d structures formed using square layers

Answer 11

6

Question 12

CN of hcp

Answer 12

12

Question 13

no. of particles if no. of terahedral voids is 16

Answer 13

8

Question 14

relationship between r and a for bcc, fcc and simple cubic

Answer 14

r=aroot3/4, aroot2/4, a/2

Question 15

formula of density

Answer 15

M×Z/(Na×V)

Question 16

PE of the 3 unit cells

Answer 16

simple 52%, fcc 74%, bcc 68%

Question 17

types of stoichiometric defects and definitions

Answer 17

vacany, interstitial, schottky, frankel

Question 18

rc<ra for which- schottky/frankel

Answer 18

frankel

Question 19

metal excess and deficiency defects definition

Answer 19

.

Question 20

colour of nacl without defect and with defect

Answer 20

white, yellow

Question 21

colour of LiCl and KCl with defect

Answer 21

pink, purple

Question 22

colour of LiCl and KCl with defect

Answer 22

pink, purple

Question 23

which defect does AgBr show?

Answer 23

both schottky and frankel

Question 24

why are solids rigit?

Answer 24

The constituent particles in solids have fixed positions and can oscillate about their mean positions.

Question 25

Why do solids have definite volume?

Answer 25

Solids keep their volume because of rigidity in their structure. The interparticle forces are very strong. Moreover, the interparticle spaces are very few and small as well. As a result, their volumes cannot change by applying pressure.

Question 26

why is glass considered to be super cooled liquid?

Answer 26

Glass is considered to be super cooled liquid because it shows some of the characteristics of liquids, though it is an amorphous solid. For example, it is slightly thicker at the bottom. This can be possible only if it has flown like liquid, though very slowly.

Question 27

significance of lattice point

Answer 27

The lattice point denotes the position of a particular constituent in the crystal lattice. It may be atom, ion or a molecule. The arrangement of the lattice points in space is responsible for the shape of a particular crystalline solid.

Question 28

What is the two-dimensional coordination number of a molecule in a square close-packed layer?

Answer 28

4

Question 29

frenkel defect is also called-

Answer 29

dislocation defect

Question 30

What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?

Answer 30

When a solid is heated, vacancy defect is produced in the crystal. On heating, some atoms or ions leave the lattice site completely, i.e., lattice sites become vacant. As a result-of this defect, density of the substances decreases.

Question 31

Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it.

Answer 31

when a cation of higher valence is added as an impurity to an ionic solid, two or more cations of lower valency are replaced by a cation of higher valency to maintain electrical neutrality

Question 32

What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic.

Answer 32

ferromagnetic. when placed in magnetic field, their domains get oriented in the directions of magnetic field and a strong magnetic field is produced. This ordering of domains persists even when external magnetic field is removed.

Question 33

which type of solids are soft and have a low melting points?

Answer 33

molecular

Question 34

which type of solids are hard and brittle and have a high melting point?

Answer 34

ionic

Question 35

defects shown by KCl

Answer 35

schottky and metal excess

Question 36

ferrimagnetic substance?

Answer 36

domains align in uneven manner

Question 37

rubber and plastic are _ solids (amorphous or crystalline)

Answer 37

amorphous

Question 38

meaning of amorphous in Greek

Answer 38

no form

Question 39

antiferromagnetic

Answer 39

domains align in such a way that they cancel out e/o

Question 40

what type of a solid is diamond?

Answer 40

network

Question 41

which of the following is a conductor in solid state? mg, TiO, I2, H2O

Answer 41

Mg

Question 42

what compounds behave as conductors or insulator based on temp?

Answer 42

VO, VO2, VO3, TiO3

Question 43

CrO2 shows electrical properties like _

Answer 43

metals

Question 44

e can only occupy _ site

Answer 44

interstitial

Question 45

charge acquired by ptye and ntype is

Answer 45

neutral

Question 46

coordination no hcp

Answer 46

12

Question 47

in ccp unit cell has _ tdv within

Answer 47

8

Question 48

_ of _layer are covered by spheres of _ layer in hcp

Answer 48

tdv, 2nd, 3rd

Question 49

order of conductivity (k) in solids

Answer 49

metals>>insulators

Question 50

NaCl is an example of _ system

Answer 50

cubic

Question 51

KNO3 is a _ crystal structure

Answer 51

orthorhombic