States of Matter – V

1) Which of the following is a covalent solid?
a) Fe
b) Diamond
c) NaCI
d) Cu

2) The 8:8 type of packing is present in
a) NaCl
b) KCl
c) CsCl

3) An aqueous solution of methanol has a vapour pressure
a) equal to that of water
b) equal to that of methanol
c) more than that of water
d) less than that of water

4) The number of atoms contained in a fcc unit cell of a monoatomic substance is
a) 1
b) 2
c) 4
d) 6

5) How many spheres surround an octahedral void ?
a) 6
b) 4
c) 8
d) 12

6) The number of spheres in contact with a tetrahedral void is:
a) 3
b) 6
c) 4
d) 8

7) Most crystals show good cleavage because their atoms, ions or molecules are
a) weakly bonded together
b) strongly bonded together
c) spherically symmetrical
d) arranged in planes

8) For an orthorhombic system the axial ratios are and the axial angles are

9) The three states of matter are solid, liquid and gas. Which of the following statements is true about them?
a) Gases and liquids have viscosity as a common property
b) The molecules in all the three states possess random translational motion
c) Gases cannot be converted into solids without passing through the liquid phase
d) Solids and liquids have pressure as a common property

10) Which of the following molecules has a three fold axis of symmetry?

11) In a solid lattice the cation has left a lattice site and is located at an interstitial position. The lattice defect is a/an
a) Interstitial defect
b) Vacancy defect
c) Frenkel defect
d) Schottky defect

12) A closed flask contains water in all its three states solid, liquid and vapour at
In this situation the average kinetic energy of water molecules will be

a) the greatest in all the three states
b) the greatest in the vapour state
c) the greatest in the liquid state
d) the greatest in the solid state

13) Which of the following has hcp crystal structure?
a) NaCl
b) CaCl
c) Zn
d) RbCl

14) The coordination number for Cu is
a) 1
b) 6
c) 8
d) 12

15) In the fluorite structure, the coordination number of the ion is:
a) 4
b) 6
c) 8
d) 3

16) On doping Ge metal with a little of ln, one gets a/an
a) p-type semi conductor
b) n-type semi conductor
c) insulator
d) rectifier

17) Among the following which compound will show the highest lattice energy?
a) KF
b) NaF
c) CsF
d) RbF

18) In graphite, the electrons are
a) localized on each carbon atom
b) spread out between the sheets
c) localized on every third carbon atom
d) present in an antibonding orbital

19) Potassium crystallizes in a bcc lattice, hence the coordination number of potassium in potassium metal is
a) 0
b) 4
c) 6
d) 8

20) A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and at a still higher temperature the turbidity completely disappears. This behaviour is a characteristic of the substance forming
a) Allotropic crystals
b) Liquid crystals
c) Isomeric crystals
d) Isomorphous crystals

21) NaCl is an example ofa/an
a) Ionic solid
b) Covalent solid
c) Metallic solid
d) molecular solid

22) A tetragonal crystal system has the following unit cell dimensions:

23) For an ionic crystal of the general formula AX and co-ordination number 6, the radius ratio value will be
a) greater than 0.73
b) between 0.73 and 0.41
c) between 0.41 and 0.22
d) less than 0.22

24) The space lattice of is
a) fcc
b) bcc
c) simple cubic
d) hcp

25) The existence of a substance in more than one solid modification is known as
a) Isomorphism
b) Polymorphism
c) Amorphism
d) Allotropy

26) A match box exhibits
a) Cubic geometry
b) Monoclinic geometry
c) Tetragonal geometry
d) Orthorhombic geometry

27) In CsCl structure, each ion is surrounded by

28) In CsCl, if the coordination number of is 8, then the coordination number of the ion is
a) 4
b) 6
c) 8
d) 12

29) A liquid can exist only
a) between triple point and critical temperature
b) at any temperature above the melting point
c) between melting point and critical temperature
d) between boiling and melting temperature

30) The vapour pressure of a substance on increasing temperature
a) always increases
b) always decreases
c) does not depend on temperature
d) may increase or decrease

31) For a covalent solid, the units which occupy the lattice points are
a) atoms
b) ions
c) molecules
d) electrons

32) When electrons are trapped into the crystal in an anion vacancy, the defect is known as a
a) Schottky defect
b) Frenkel defect
c) Stoichiometric defect
d) F-centres

33) Pick out the solid with highest electrical and thermal conductivity from the following:
a) Si
b) Li
c) NaCl
d) Ice

34) The maximum proportion of available volume that can be filled by hard spheres in diamond is
a) 0.52
b) 0.34
c) 0.32
d) 0.68

35) Which of the following is an example of a body centred cube?
a) Mg
b) Zinc
c) Copper
d) Sodium

36) In the laboratory, sodium chloride is made by burning sodium in an atmosphere of chlorine. The salt obtained is yellow in colour. The cause of the yellow colour is the
c) Presence of electrons in the crystal lattice
d) Presence of a face centred cubic crystal lattice

37) Which of the following describes the hexagonal close packed arrangement of spheres?

38) Into how many basic crystal habits can crystals be classified into?
a) 7
b) 4
c) 14
d) 2

39) A body-centred cubic lattice has a coordination number of
a) 4
b) 8
c) 12
d) 6

40) If one end of a piece of a metal is heated the other and becomes hot after some time. This is due to the
a) Energised electrons moving to the other part of the metal
b) Resistance of the metal
c) Mobility of atoms in the metal
d) Minor perturbation in the energy of atoms

41) In the crystal structure of sodium chloride, the arrangement of ions is
a) fcc
b) bcc
c) both fcc and bcc
d) none of these

42) Which of the following is not a crystalline solid?
a) KCI
b) CsCI
c) Glass
d) Rhombic S

43) If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?
a) p-type
b) n-type
c) both (a) and (b)
d) none of the two

44) A metallic crystal crystallizes into a lattice containing a sequence of layers AB AB AB….Any packing of spheres leaves out voids in the lattice. What percentage of the volume of this lattice is empty space?
a) 74%
b) 26%
c) 50%
d) none of these

45) The vapour pressure of water at 300K in a closed container is 0.4 atm. If the volume of the container is doubled, its vapour pressure at 300 K will be
a) 0.8 atm
b) 0.2 atm
c) 0.4 atm
d) 0.6 atm

46) A solid has a structure in which W atoms are located at the corners of a cubic lattice, O atoms at the centre of edges and Na atom at centre of the cube. The formula for the compound is

47) Which of the following is a ferroelectric compound?
d) none of these

48) The intermetallic compound LiAg crystallizes in a cubic lattice in which both lithium and silver have a co-ordination number of eight. The crystal class is
a) Simple cubic
b) Body centred cubic
c) Face-centred cubic
d) None of these

49) The critical temperature of water is higher than that of because the molecule has
b) two covalent bonds
c) V-shape
d) a dipole moment.

50) In the crystals of which of the following ionic compounds would you expect the maximum distance between the centres of the cations and anions?
a) LiF
b) CsF
c) Csl
d) Lil

51) The Schottky defect in crystals is observed when
a) an unequal number of cations and anions are missing from the lattice
b) an equal number of cations and anions are missing from the lattice
c) an ion leaves its normal site and occupies an interstitial site
d) the density of the crystal is increased

52) How many kinds of space lattices are possible in a crystal?
a) 23
b) 7
c) 230
d) 14

53) Potassium crystallizes with a
a) Face-centred cubic lattice
b) Body-centred cubic lattice
c) Simple cubic lattice
d) Orthorhombic lattice

54) The co-ordination number of a metal crystallising in a hexagonal close packed structure is
a) 12
b) 4
c) 8
d) 6

55) The relationship which describes the variation of vapour pressure with temperature is called
a) Hess law
b) Arrhenius equation
c) Kirchoffs law
d) Clausius-Clapeyron equation

56) A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the corners of a cube and B atoms are at the face-centres. The formula of the compound is
b) AB

57) The number of unit cells in 58.8 g of NaCl is nearly

58) The number of octahedral sites per sphere in an fcc structure is
a) 8
b) 4
c) 2
d) 1

59) The packing fraction for a body-centred cubic is
a) 0.42
b) 0.53
c) 0.68
d) 0.82

60) Which of the following has Frenkel defects?
a) Sodium chloride
b) Graphite
c) Silver bromide
d) Diamond

61) In NaCl, the chloride ions occupy the space in the fashion of
a) fcc
b) bcc
c) both
d) none

62) In a solid AB having the NaCl structure, A atoms occupy the corners of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

63) A compound is formed by elements A and B. This crystallises in the cubic structure when atoms A are at the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is
a) AB

64) A compound formed by elements A and B has a cubic structure in which A atoms are at the corners of the cube and B atoms are at the face centres. The formula of the compound will be

65) A compound contains P and Q elements. Atoms Q are in ccp arrangement while P occupy all tetrahedral sites. Formula of compound is
a) PQ

66) A binary solid has a zinc blende structure with ions constituting the lattice and ions occupying 25% tetrahedral holes. The formula of the solid is
a) AB

67) In a metal oxide, the oxide ions are arranged in hexagonal close packing and metal ions occupy two-third of the octahedral voids. The formula of the oxide is
a) MO

68) A solid AB has NaCl type structure. If the radius of the cation A is 100 pm, then the radius of the anion B will be
a) 241 pm
b) 414 pm
c) 225 pm
d) 44.4 pm

69) An element (atomic mass=100 g/mol) having bcc structure has unit cell edge 400 pm. The density of the element is

70) The ionic radii of and are 1.46 and 2.16 respectively. The most probable type of structure exhibited by it is
a) CsCI type
b) NaCl type
c) ZnS type

71) If the radius of and are 133 pm and 136 pm respectively, the distance between and in KF is
a) 269 pm
b) 134.5 pm
c) 136 pm
d) 3 pm

72) The C-C and Si-C interatomic distances are 154 pm and 188 pm. The atomic radius of Si is
a) 77 pm
b) 94 pm
c) 114 pm
d) 111 pm

73) The second order Bragg diffraction of X-rays with from a set of parallel planes in a metal occurs at an angle of . The distance between the scattering planes in a crystal is

74) The wavelength of X-rays which gives a diffraction angle, equal to for a first order diffraction for a crystal with interplanar distance 0.200nm, is (given sin )
a) 0.0584 nm
b) 0.1168 nm
c) 0.0292 nm
d) 0.2336 nm

75) X-rays of wavelength equal to 0.134 nm give a first order diffraction from the surface of a crystal when the value of The distance between the planes in the crystal parallel to the surface is
a) 0.368 nm
b) 0.1168 nm
c) 0.0292 nm
d) 0.2336 nm

76) NaCl is doped with . The concentration of cation vacancies is

77) A binary solid has a rock salt structure. If the edge length is 400 pm and radius of cation is 75 pm, the radius of the anion is
a) 100 pm
b) 125 pm
c) 250 pm
d) 325 pm

78) If the radius of an atom of an element is 75 pm and the lattice is body-centred cubic, the edge of the unit cell will be
a) 32.475 pm
b) 173.2 pm
c) 37.5 pm
d) 212.1 pm

79) A solid has a bcc structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is
a) 200 pm
c) 142.2 pm

80) Sodium metal crystallises in a bcc lattice with the cell edge . What is the radius of a sodium atom?

81) Potassium has a bcc structure with the nearest neighbour distance being . Its atomic weight is 39. Its density will be

82) Elements were classified into groups of three, called triads, by
a) Newlands
b) Dobereiner
c) Prout
d) Lothar Meyer

83) Which of the following is not a Dobereiner triad?
a) Cl, Br, I
b) Ca, Sr, Ba
c) Li, Na, K
d) Fe, Co, Ni

84) The law of octaves was enunciated by
a) J. W. Dobereiner
b) J. A. R. Newlands
c) Lothar Meyer
d) D. I. Mendeleev

85) The discovery of which of the following group of elements gave a death blow to Newlands’ law of octaves?
a) Inert gases
b) Alkaline earths
c) Rare earths
d) Actinides

86) Lothar Meyer plotted a graph between
a) Atomic volume versus atomic number
b) Atomic volume versus atomic weight
c) Atomic number versus ionisation potential
d) Atomic weight versus ionisation potential

87) Which of the following statement is wrong about Lothar-Meyer’s plot between atomic volume against atomic weight?
a) The most strongly electropositive alkali metals occupy peaks on the curve
b) The most strongly electronegative halogen atoms occupy ascending positions on the curve
c) The less strongly electropositive alkaline earth metals occupy descending positions on the curve
d) None of the above

88) Which of the following sets can be called isoelectronic species ?
c) Na, Mg

89) Solid NaCl is a bad conductor of electricity because
a) In solid NaCl there are no ions
b) Solid NaCl is covalent
c) In solid NaCl there is no mobility of ions
d) In solid NaCl there are no electrons

90) Molten sodium chloride conducts electricity due to the presence of
a) Free electrons
b) Free molecules
c) Free sodium and chloride atoms
d) Free sodium and chloride ions

91) The stability of ionic crystals depends principally on
a) the high electron affinity of the anion forming species
b) The lattice energy of the crystal
c) Low I. E of the cation forming species
d) Low heat of sublimation of the cation forming solid

92) The magnitude of the lattice energy of a solid increases if
a) the ions are large
b) the ions are small
c) the ions are of equal size
d) charges on the ions are small

93) The Born-Harber cycle is used to determine
a) Electronegativity
b) Lattice energy
c) Both
d) None

94) Which of the following substances has the highest melting point?
a) NaCl
b) KCl
c) MgO
d) BaO

95) Which one is the highest melting halide?
a) NaCl
b) NaF
c) NaBr
d) Nal

96) Ionic reactions occur in
a) aqueous solutions and organic solvents of high polarity
b) Non-polar solvents or solvents of low polarity
c) the gaseous state
d) the solid state

97) The energy of a is greater than that of a orbital because

98) The distribution of electrons in the molecular orbitals of the molecules is as follows:

99) Which of the following species has the lowest ionization potential?
a) O

100) The normality of 10% solution (d =1.1 g solution) is
a) 2.04
b) 1.02
c) 1.85
d) 2.25


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