CBSE Class 12 Chemistry The Solid State MCQs Set 03

Question: How many chloride ions are surrounding sodium ion in sodium chloride crystal ?
(a) 4
(b) 8
(c) 6
(d) 12

Answer : C

Question: How many times is the number of octahedral voids as compared to tetrahedral voids ?
(a) 4
(b) 8
(c) 2
(d) 0.5

Answer : D

Question: Alkali halids do not show Frenkel defect because
(a) cations and anions have almost equal size
(b) there is a large difference in size of cations and anions
(c) cations and anions have low coordination number
(d) anions cannot be accommodated in voids

Answer : A

Question: Select the non-conductor substance from the following.
(a) NaCl
(b) P4
(c) Cr
(d) KNO3

Answer : B

Question: Which of the following cannot be regarded as molecular solid ? (i) SiC (Silicon carbide) (ii) AlN (iii) Diamond (iv) I2
(a) (i), (ii) and (iii)
(b) (ii) and (iii)
(c) (iv)
(d) (ii) and (iv)

Answer : A

Question: In face-centred cubic lattice, a unit cell is shared equally by how many unit cells
(a) 2
(b) 4
(c) 6
(d) 8

Answer : C

Question: The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be
(a) 10 g cm^-3
(b) 14.2 g cm^-3
(c) 6.15 g cm^-3
(d) 9.3 2 g cm^-3

Answer : C

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

Answer : C

Question: The distance between Na^– and CL^– ions in NaCl with a density 2.165 g cm^-3 is
(a) 564 pm
(b) 282 pm
(c) 234 pm
(d) 538 pm

Answer : B

Question: What type of solid is sodium chloride ?
(a) Ionic
(b) Molecular
(c) Covalent
(d) Metallic

Answer : A

Question: When molten zinc is converted into solid state, it acquires hcp structure. The number of nearest neighbours of Zn will be
(a) 6
(b) 12
(c) 8
(d) 4

Answer : B

Question: Which of the following conditions favours the existence of a substance in the solid state?
(a) High temperature
(b) Low temperature
(c) High thermal energy
(d) Weak cohesive forces

Answer : B

Question: Hexagonal close packed arrangement of ions is described as
(a) ABC ABA
(b) ABC ABC
(c) ABABA
(d) ABBAB

Answer : C

Question: What type of solid is quartz ?
(a) Ionic
(b) Molecular
(c) Covalent
(d) Metallic

Answer : C

Question: Which of the following metal(s) show(s) hexagonal close packed structure (hcp)
(a) Ag, Zn
(b) Mg, Zn
(c) Cu, Fe
(d) Na, Li

Answer : B

Question: Which of the following will have metal deficiency defect?
(a) NaCl
(b) FeO
(c) KCl
(d) ZnO

Answer : B

Question: In the hexagonal close packed structure of a metallic lattice, the number of nearest neighbours of a metallic atom is
(a) twelve
(b) four
(c) eight
(d) six

Answer : A

Question: What is the number of atoms in the unit cell of body centred cube ?
(a) 2
(b) 1
(c) 4
(d) 6

Answer : A

Question: Which of the following is not a characteristic property of solids?
(a) Intermolecular distances are short.
(b) Intermolecular forces are weak.
(c) Constituent particles have fixed positions.
(d) Solids oscillate about their mean positions.

Answer : B

Question: Fe₃O₄ (magnetite) is an example of
(a) normal spinel structure
(b) inverse spinel structure
(c) fluoride structure
(d) anti fluorite structure

Answer : B

Question: Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order
(a) 287 pm
(b) 574 pm
(c) 124.27 pm
(d) 143.5 pm

Answer : C

Question: “Crystalline solids are anisotropic in nature. What is the meaning of anisotropic in the given statement?
(a) A regular pattern of arrangement of particles which repeats itself periodically over the entire crystal.
(b) Different values of some of physical properties are shown when measured along different directions in the same crystals.
(c) An irregular arrangement of particles over the entire crystal.
(d) Same values of some of physical properties are shown when measured along different directions in the same crystals.

Answer : B

Question: To get n-type of semiconductor, germanium should be doped with
(a) gallium
(b) arsenic
(c) aluminium
(d) boron

Answer : B

Question: Which of the following is not a characteristic of a crystalline solid ?
(a) Definite and characteristic heat of fusion.
(b) Isotropic nature.
(c) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.
(d) A true solid

Answer : B

Question: Which of the following is not a crystalline solid?
(a) KCl
(b) CsCl
(c) Glass
(d) Rhombic S

Answer : C

Question: What type of crystal structure is of silver metal ?
(a) fcc
(b) Simple cube
(c) bcc
(d) Metallic

Answer : A

Question: Which of the following is not a crystalline solid?
(a) KCl
(b) CsCl
(c) Glass
(d) Rhombic S

Answer : C

Question: A unit cell of BaCl₂ (fluorite structure) is made up of
(a) four Ba²⁺ ions and four Cl^– ions
(b) four Ba^2- ions and eight Cl^– ions
(c) eight Ba² ions and four Cl^– ions
(d) four Ba² ions and six Cl^– ions

Answer : B

Question: Which of the following statement is not true about amorphous solids ?
(a) On heating they may become crystalline at certain temperature.
(b) They may become crystalline on keeping for long time.
(c) Amorphous solids can be moulded by heating.
(d) They are anisotropic in nature.

Answer : D

Question: In NaCl structure
(a) all octahedral and tetrahedral sites are occupied
(b) only octahedral sites are occupied
(c) only tetrahedral sites are occupied
(d) neither octahedral nor tetrahedral sites are occupied

Answer : B

Question: The sharp melting point of crystalline solids is due to 
(a) a regular arrangement of constituent particles observed over a short distance in the crystal lattice.
(b) a regular arrangement of constituent particles observed over a long distance in the crystal lattice.
(c) same arrangement of constituent particles in different directions.
(d) different arrangement of constituent particles in different directions.

Answer : B

Question: The melting points of ionic solids are
(a) Very high
(b) Normal
(c) Very low
(d) Abnormal

Answer : A

Question: Why some glass objects from ancient civilisations are found to become milky in appearance?
(a) Glass is a crystalline solid, milky appearance is due to its crystalline nature.
(b) Glass is amorphous but on heating it become crystalline at some temperature.
(c) Because of reaction of glass with impurities present in the atmosphere.
(d) None of these.

Answer : B

Question: Which of the following amorphous solid is used as photovoltaic material for conversion of sunlight into electricity?
(a) Quartz glass
(b) Quartz
(c) Silicon
(d) Both (a) and (b)

Answer : C

Question: An example of a covalent crystalline solid is:
(a) Si
(b) Al
(c) NaF
(d) Ar

Answer : A

Question: Among solids, the highest melting point is exhibited by
(a) Covalent solids
(b) Ionic solids
(c) Pseudo solids
(d) Molecular solids

Answer : A

Question: Which of the following exists as covalent crystals in the solid state ?
(a) Iodine
(b) Silicon
(c) Sulphur
(d) Phosphorus

Answer : B

Question: In graphite electrons are :
(a) localised on each carbon atom
(b) spread out between the sheets
(c) localised on every third carbon atom
(d) present in antibonding orbital.

Answer : B

Question: What is the percentage packing efficiency of simple cube ?
(a) 53.26
(b) 68.0
(c) 74.0
(d) 52.36

Answer : D

Question: Which one of the following forms a molecular solid when solidified?
(a) Silicon carbide
(b) Calcium fluoride
(c) Rock salt
(d) Methane

Answer : D