A binary solid AB having radius ratio 0.52 is most likely to have
1.zinc blende structure
2.rock-salt structure
3.fluorite structure
4.antifluorite structure.
A crystal may have one or more planes of symmetry as well as one or more than one axis of symmetry but it has only no centre of symmetry.
1.two centres of symmetry
2.one centre of symmetry
3.four centres of symmetry
4.no centre of symmetry
A match box exhibits
1.cubic geometry
2.rectangular geometry
3.orthorhombic geometry
4.monoclinic geometry.
A metal M has FCC arrangement and edge length of the unit cell is 400 pm. The atomic radius of M is
1.100 pm
2.200 pm
3.141 pm
4.173 pm.
A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at a higher temperature the turbidity completely disappears. The behaviour is a characteristic of substance forming
1.allotropic crystal
2.liquid crystal
3.isomeric crystal
4.isomorphous crystal.
A simple cubic lattice consists if eight identical spheres of Radius R in contact placed at the corners of the cube what fraction of the total volume of cube is actually occupied by the cube?
1.74%
2.68%
3.52.40%
4.66%.
An atom at the edge centre of the cubic unit cell contributes??? to the particular unit cell.
1.2-Jan
2.1
3.8-Jan
4.1/4.
An element A crystallizes by adoption AB AB AB??? pattern of close packing the number of atoms in the unit cell is
1.6
2.3
3.4
4.8
Body diagonal of a cube is 866 pm. Its edge length would be
1.408 pm
2.1000 pm
3.500 pm
4.600 pm.
Certain intermetallic compound of lithium and silver crystallizes in cubic structure in which both Li and Ag atoms have co-ordination number of 8. To what crystal class does the unit cell belong?
1.Primitive cubic
2.bcc
3.fcc
4.End centred.
Clay is an example of
1.Orthosilicate
2.Sheet silicate
3.Chain silicate
4.Frame work silicate.
Crystals can be classified into??? basic crystal habits.
1.7
2.14
3.3
4.2
During evaporation of liquid
1.temperature of liquid will rise
2.temperature of liquid will fall
3.temperature of liquid may rise or fall depending upon its nature
4.temperature of liquid remains unaffected.
Edge length of a cube is 300 pm. Its body diagonal would be
1.600 pm
2.423 pm
3.519 pm
4.None of these.
Edge length of a cubic unit cell is 400 pm. Its face diagonal would be
1.600 pm
2.200 pm
3.566 pm
4.692 pm.
fcc arrangement of atoms contains number of atoms in each unit cell equal to
1.4
2.6
3.3
4.8
For a cubic void the radius ratio is equal to
1.0.225
2.0.414
3.0.732
4.0.155.
For and atomic crystal having body centred cubic unit cells the number of atoms per unit cell is
1.4
2.8
3.9
4.2
hich of the following is an example of molecular solid?
1.ZnS
2.MgO
3.Ice
4.Diamond.
How many four fold axes and three fold axes are there in a cube respectively?
1.1 1
2.2 3
3.3 3
4.4 3.
If a is edge length of a face centred cubic unit cell then the distance of closest approach of two particles is
1.0.866a
2.1.732a
3.1.414a
4.0.707a.
In a body centred cubic unit cell of a metallic substance the number of atoms per unit cell is
1.4
2.1
3.2
4.3
In a close packing the radius of the octahedral void relative to the radius of the spheres constitution it is
1.0.732
2.0.225
3.0.414
4.0.155.
In a cubic crystal anions are arranged in FCC and the cations occupy half the tetrahedral voids and all the octahedral voids. The ratio of cations and anions in the crystal is
1.1:01
2.2:01
3.1:02
4.3:02
In a face centred cubic lattice the number of nearest neighbours for a given lattice point is
1.6
2.4
3.8
4.12
In a metal M having BCC arrangement edge length of the unit cell is 400 pm. The atomic radius of M is
1.100 pm
2.141 pm
3.173 pm
4.200 pm.
In antifluorite structure the percentage of octahedral voids occupied is
1.100%
2.0%
3.50%
4.25%.
In antifluorite structure what percentage of the tetrahedral voids is occupied by cations?
1.0%
2.50%
3.100%
4.25%.
In CsCl structure the number of anions per unit cell is
1.One
2.Two
3.Three
4.Four.
In hexagonal close packing of spheres in three dimensions the co-ordination number of each spheres is
1.6
2.3
3.12
4.9
In rock salt structure coordination numbers of cation and anion are respectively.
1.4 6
2.6 6
3.8 6
4. 12 6
In rock salt structure what percentage of the octahedral voids are occupied by cations?
1.50%
2.100%
3.25%
4.33%.
In which of the following arrangements a metal would have least density?
1.BCC
2.CCP
3.HCP
4.In all the three arrangements the density would be same.
In zinc blende structure coordination number of cation is
1.6
2.4
3.8
4.12
In zinc blende structure coordination number of cation is
1.4
2.6
3.8
4.12
In zinc blende structure the distance of closest approach between two anions is equal to
1.half the edge length
2.half the face diagonal
3.3/4 th of body diagonal
4.body diagonal.
In zinc blende structure the number of formula units present in the unit cell is
1.4
2.6
3.1
4.8
Ionic solids with Schottky defects contain in their structures
1.equal number of cation and anion vacancies
2.interstitial anions and anion vacancies
3.cation vacancies only
4.cation vacancies and interstitial cations.
NaCl is an example of
1.ionic solid
2.covalent solid
3.metallic solid
4.molecular solid.
Number of mirror planes in a cube is
1.4
2.6
3.9
4.5
Potassium crystallizes with
1.fcc lattice
2.bcc lattice
3.simple cubic lattice
4.orthorhombic lattice.
Pure silicon doped with phosphorus is
1.amorphous
2.p-type conductor
3.n-type conductor
4.insulator.
Rate of evaporation of a liquid does not depend upon
1.nature of liquid
2.temperature
3.Atmospheric pressure
4.Size of vessel.
The Edge length of face centred cubic unit cell is 508 pm. If the radius of cation is 110 pm the radius of anion is
1.110 pm
2.144 pm
3.618 pm
4.398 pm.
The existence of a substance in more than one solid modification is known as
1.isomorphism
2.polymorphism
3.amorphism
4.allotropy.
The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have co-ordination number of 8. The crystal class is
1.simple cube
2.body centred cube
3.face centred cube
4.end centred cube.
The number of kinds of space lattices that are possible in a crystal is
1.23
2.7
3.230
4.14
The number of NaCl units in a unit cell of its crystal
1.2
2.4
3.6
4.8
The number of octahedral and tetrahedral voids per sphere in a cubic close packed arrangement is respectively.
1.1 and 3
2.6 and 4
3.1 and 2
4.2 and 1.
The number of octahedral voids in HCP arrangement of N spheres is
1.2 N
2.N
3.3 N
4.4 N.
The percentage of the available space occupied in a hexagonal close packing of spheres in three dimensions is
1.76%
2.26%
3.52.40%
4.74%.
The ratio of close packed atoms to tetrahedral holes in cubic close packing
1.1:01
2.1:03
3.1:02
4.2:01
The tetrahedral holes occupied in diamond are
1.50%
2.25%
3.75%
4.100%.
What is not true about amorphous solids? I. They undergo clean cleavage II. They do not have sharp melting pointsIII. They have high degree of rigidityIV. They exhibit isotropy. I
1.II III
2.I
3.V
4.IV.
What is true about solids? I. Interparticle distance is minimumII. K.E. of particles is highIII. Interparticle attraction is largeIV. All solids have sharp mp and bp.
1.I II III
2.Only II
3.I III
4.IV II.
What type of defect creates F-centres in the crystal?
1.Non-stoichiometric defect
2.Metal excess defect due to anion vacancies
3.Metal excess defect due to extra cation
4.Frenkel defect.
When a cation and an anion are missing leaving behind a pair of voids the defect is known as:
1.F-centre
2.Schottky defect
3.Frenkel defect
4.None of these.
When a cation leaves its normal position in the crystal and moves to some interstitial space the defect in the crystal is known as
1.Schottky defect
2.F-centre
3.Frenkel defect
4.Non-stochiometric defect.
When electrons are trapped in the crystal lattice in place of anion vacancy the defect in the crystal is known as
1.Frenkel defect
2.Schottky defect
3.F-centre
4.Dislocations.
Which of the following compound is an example of molecular solid?
1.Diamond
2.Dry ice
3.Sodium chloride
4.Zinc sulphide.
Which of the following compounds has hexagonal structure?
1.Diamond
2.Graphite
3.NaCl
4.KCl.
Which of the following compounds is an example of network solid?
1.Corrundum
2.Carborundum
3.Dry ice
4.Ice.
Which of the following describes hexagonal closed packed arrangement of spheres?
1.ABC ABA..............
2.ABC ABC...........
3.ABA BA...........
4.ABB ABB........
Which of the following is an anti-ferroelectric solid?
1.Barium titanate
2.Sodium potassium tartrate
3.Potassium hydrogen
4.Lead zirconate.
Which of the following is hcp crystal structure?
1.NaCl
2.CsCl
3.Zn
4.RbCl.
Which of the following is not a property of crystalline solid?
1.Isotropy
2.Anisotropy
3.Sharp melting point
4.Definite geometry.
Which of the following of species are likely to exhibit Frenkel type defect?
1.NaBr Ad Br
2.ZnS CsCl
3.AgBrZnS
4.CsCl NaCl.
Which of the following pairs of species are likely to show Schottky type defects?
1.NaCl ZnS
2.CsCl NaCl
3.ZnS AgBr
4.AgBr NaCl.
Which of the following unit cells has the highest symmetry?
1.Hexagonal
2.Orthorhombic
3.Cubic
4.Monoclinic.
Which type of silicates involve sharing of two oxygen atoms between silicon atoms?I. single chain silicate II. ring silicateIII. sheet silicate IV. double chain silicate.
1.I III
2.I II
3.III IV
4.III VI