Quiz Tweek

The Solid State Set-1

Test your knowledge on Solid States from Chemistry, Class 12.

80

Minutes

59

Questions

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Questions in this Quiz

Q1: Chottky defect defines imperfection in the lattice structure of
  • solid
  • gas
  • liquid
  • plasma
Q2: An $AB_2$ type structure is found in
  • NaCl
  • $CaF_2$
  • $Al_2O_3$
  • $N_2O$
Q3: An element (atomic mass $100\ g/mol$) having $bcc$ structure has unit cell edge $400\ pm$. The density of element is (No. of atoms in $bcc$, $Z = 2$)
  • $2.144\ g/cm^3$
  • $7.289\ g/cm^3$
  • $5.188\ g/cm^3$
  • $10.376\ g/cm^3$
Q4: What is the coordination number of sodium in $Na_2O$?
  • 6
  • 4
  • 8
  • 2
Q5: The compound, found in nature in gas phase but ionic in solid state is
  • $PCl_5$
  • $CCl_4$
  • $PCl_3$
  • $POCl_3$
Q6: The $Ca^{2+}$ and $F^–$ are located in $CaF_2$ crystal, respectively at face centred cubic lattice points and in
  • Tetrahedral voids
  • Half of tetrahedral voids
  • Octahedral voids
  • Half of octahedral voids
Q7: The coordination number in $hcp$ is
  • 6
  • 12
  • 18
  • 24
Q8: The space lattice of graphite is
  • Cubic
  • Tetragonal
  • Rhombic
  • Hexagonal
Q9: Coordination numbers of $Zn^{2+}$ and $S^{2–}$ in the crystal structure of wurtzite are
  • 4, 4
  • 6, 6
  • 8, 4
  • 8, 8
Q10: Gold has a face centred cubic lattice with an edge length of the unit cube of $407\ pm$. Assuming the closest packing, the diameter of the gold atom is
  • $576.6\ pm$
  • $287.8\ pm$
  • $352.5\ pm$
  • $704.9\ pm$
Q11: Which is not correct about the Schottky defects?
  • Both cations and anions are missing from their lattice sites without affecting the stoichiometry of the compound
  • Because of presence of holes the lattice energy decreases.
  • The presence of holes causes the density of the crystal to decrease.
  • The defect increases the electrical of the ions into the holes.
Q12: The existence of a substance in more than one solid modifications is known as
  • isomorphism
  • Polymorphism
  • Amorphism
  • Allotropy
Q13: An element (atomic mass = $100\ g / mol$) having $bcc$ structure has unit cell edge $400\ pm$. Then, density of the element is
  • $10.376\ g/cm^3$
  • $5.188\ g/cm^3$
  • $7.289\ g/cm^3$
  • $2.144\ g/cm^3$
Q14: If AgI crystallises in zinc blende structure with $I^–$ ions at lattice points. What fraction of tetrahedral voids is occupied by $Ag^+$ ions?
  • $25\%$
  • $50\%$
  • $100\%$
  • $75\%$
Q15: Which set of following characteristics for $ZnS$ crystal is correct?
  • Coordination number (4 : 4); $ccp$; $Zn^{2+}$ ion in the alternate tetrahedral voids
  • Coordination number (6 : 6); $hcp$; $Zn^{2+}$ ion in all tetrahedral voids.
  • Coordination number (6 : 4); $hcp$; $Zn^{2+}$ ion in all octahedral voids
  • Coordination number (4 : 4); $ccp$; $Zn^{2+}$ ion in all tetrahedral voids.
Q16: Which one of the following statements about packing in solids is incorrect ?
  • Coordination number in $bcc$ mode of packing is 8.
  • Coordination number in $hcp$ mode of packing is 12.
  • Void space in $hcp$ mode of packing is $32\%$.
  • Void space is $ccp$ mode of packing is $26\%$.
Q17: Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of $4.29\AA$. The radius of sodium atom is approximately :
  • $5.72\AA$
  • $0.93\AA$
  • $1.86\AA$
  • $3.22\AA$
Q18: Choose the correct option: Assertion :No compound has both Schottky and Frenkel defects. Reason : Both defects change the density of the solid.
  • If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  • If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
  • If Assertion is correct but Reason is incorrect.
  • If both the Assertion and Reason are incorrect.
Q19: Choose the correct option:
Assertion : Stability of a crystal is reflected in the magnitude of its melting.
Reason : The stability of a crystal depends upon the strength of the interparticle attractive force.
  • If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  • If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
  • If Assertion is correct but Reason is incorrect.
  • If both the Assertion and Reason are incorrect.
Q20: Choose the correct option:
Assertion : Due to Frenkel defect, there is no effect on the density of the crystalline solid.
Reason : In Frenkel defect, no cation or anion leaves the crystal.
  • If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  • If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
  • If Assertion is correct but Reason is incorrect.
  • If both the Assertion and Reason are incorrect.
Q21: Choose the correct option:
Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.
Reason: The electrons change their spin on heating.
  • If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  • If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
  • If Assertion is correct but Reason is incorrect.
  • If both the Assertion and Reason are incorrect.
Q22: Which of the following is not a characteristic property of solids?
  • Intermolecular distances are short.
  • Intermolecular forces are weak.
  • Constituent particles have fixed positions.
  • Solids oscillate about their mean positions.
Q23: Most crystals show good cleavage because their atoms, ions or molecules are
  • weakly bonded together
  • strongly bonded together
  • spherically symmetrical
  • arranged in planes
Q24: “Crystalline solids are anisotropic in nature. What is the meaning of anisotropic in the given tement?
  • A regular pattern of arrangement of particles which repeats itself periodically over the entire crystal.
  • Different values of some of physical properties are shown when measured along different directions in the same crystals.
  • An irregular arrangement of particles over the entire crystal.
  • Same values of some of physical properties are shown when measured along different directions in the same crystals.
Q25: A crystalline solid
  • changes abruptly from solid to liquid when heated
  • has no definite melting point
  • undergoes deformation of its geometry easily
  • has an irregular 3-dimensional arrangements
Q26: Which of the following is not a characteristic of a crystalline solid ?
  • Definite and characteristic heat of fusion.
  • Isotropic nature.
  • A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.
  • A true solid
Q27: Which of the following is not a crystalline solid?
  • KCl
  • CsCl
  • Glas
  • Rhombic S
Q28: Which of the following statements about amorphous solids is incorrect ?
  • They melt over a range of temperature
  • They are anisotropic
  • There is no orderly arrangement of particles
  • They are rigid and incompressible
Q29: Which of the following is not a crystalline solid?
  • KCl
  • CsCl
  • Glass
  • Rhombic S
Q30: Which of the following is an amorphous solid ?
  • Graphite
  • Quartz glass $(SiO_2)$
  • Chrome alum
  • Silicon carbide (SiC)
Q31: The sharp melting point of crystalline solids is due to _____.
  • a regular arrangement of constituent particles observed over a short distance in the crystal lattice.
  • a regular arrangement of constituent particles observed over a long distance in the crystal lattice.
  • same arrangement of constituent particles in different directions.
  • different arrangement of constituent particles in different directions.
Q32: Why some glass objects from ancient civilisations are found to become milky in appearance?
  • Glass is a crystalline solid, milky appearance is due to its crystalline nature.
  • Glass is amorphous but on heating it become crystalline at some temperature.
  • Because of reaction of glass with impurities present in the atmosphere.
  • None of these.
Q33: Which of the following amorphous solid is used as photovoltaic material for conversion of unlight into electricity?
  • Quartz glass
  • Quartz
  • Silicon
  • Both a) and b)
Q34: Solid $CH_4$ is
  • ionic solid
  • covalent solid
  • molecular solid
  • does not exist
Q35: An example of a covalent crystalline solid is:
  • Si
  • Al
  • NaF
  • Ar
Q36: Among solids, the highest melting point is exhibited by
  • Covalent solids
  • Ionic solids
  • Pseudo solids
  • Molecular solids
Q37: Which of the following exists as covalent crystals in the solid state ?
  • Iodine
  • Silicon
  • Sulphur
  • Phosphorus
Q38: The major binding force of diamond, silicon and quartz is
  • electrostatic force
  • electrical attraction
  • covalent bond force
  • non-covalent bond force
Q39: In graphite electrons are :
  • localised on each carbon atom
  • spread out between the sheets
  • localised on every third carbon atom
  • present in antibonding orbital.
Q40: Which one of the following forms a molecular solid when solidified?
  • Silicon carbide
  • Calcium fluoride
  • Rock salt
  • Methane
Q41: Which of the following is a network solid ?
  • $SO_2$ (solid)
  • $I_2$
  • Diamond
  • $H_2O$ (Ice)
Q42: Which of the following solids is not an electrical conductor?
  • Mg (s)
  • TiO (s)
  • $I_2$ (s)
  • $H_2O$ (s)
Q43: Iodine molecules are held in the crystals lattice by ______.
  • london forces
  • dipole-dipole interactions
  • covalent bonds
  • coulombic forces
Q44: Which of the following is not the characteristic of ionic solids?
  • Very low value of electrical conductivity in the molten state.
  • Brittle nature.
  • Very strong forces of interactions.
  • Anisotropic nature.
Q45: Graphite is a good conductor of electricity due to the presence of ______.
  • lone pair of electrons
  • free valence electrons
  • cations
  • anions
Q46: Graphite cannot be classified as ______.
  • conducting solid
  • network solid
  • covalent solid
  • ionic solid
Q47: Which of the following cannot be regarded as molecular solid ?
(i) SiC (Silicon carbide)
(ii) AlN
(iii) Diamond
(iv) $I_2$
  • (i), (ii) and (iii)
  • (ii) and (iii)
  • (iv)
  • (ii) and (iv)
Q48: Crystals can be classified into basic crystal units, equal to
  • 7
  • 4
  • 14
  • 2
Q49: How many three dimensional crystal lattice are possible?
  • 20
  • 7
  • 14
  • 10
Q50: Which of the following is the correct increasing order of packing efficiency for $hcp$, $bcc$ and simple cubic lattice?
  • $hcp < bcc <$ simple cubic
  • $bcc < hcp <$ simple cubic
  • simple cubic $< bcc < hcp$
  • simple cubic $< hcp < bcc$
Q51: In face-centred cubic lattice, a unit cell is shared equally by how many unit cells
  • 2
  • 4
  • 6
  • 8
Q52: Percentages of free space in cubic close packed structure and in body centered packed structure are respectively
  • $30\%$ and $26\%$
  • $26\%$ and $32\%$
  • $32\%$ and $48\%$
  • $48\%$ and $26\%$
Q53: The empty space in the body centred cubic lattice is
  • $68\%$
  • $52.4\%$
  • $47.6\%$
  • $32\%$
Q54: Which one of the following statements about packing in solids is incorrect ?
  • Coordination number in $bcc$ mode of packing is 8.
  • Coordination number in $hcp$ mode of packing is 12.
  • Void space in $hcp$ mode of packing is $32\%$.
  • Void space is $ccp$ mode of packing is $26\%$.
Q55: The number of atoms contained in a $fcc$ unit cell of a monoatomic substance is
  • 1
  • 2
  • 4
  • 6
Q56: In face-centred cubic lattice, a unit cell is shared equally by how many unit cells
  • 2
  • 4
  • 6
  • 8
Q57: The number of atoms per unit cell of $bcc$ structure is
  • 1
  • 2
  • 4
  • 6
Q58: When molten zinc is converted into solid state, it acquires $hcp$ structure. The number of nearest neighbours of Zn will be
  • 6
  • 12
  • 8
  • 4
Q59: Hexagonal close packed arrangement of ions is described as
  • ABC ABA
  • ABC ABC
  • ABABA
  • ABBAB EBD_7207