CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 8 - MCQExams.com

Suppose the mass of a single $$Ag-$$atom is $$m$$. $$Ag$$ metal crystallizes in fcc lattice with unit cell of length $$a$$. The density of $$Ag$$ metal in terms of $$a$$ and $$m$$ is: 
  • $$\dfrac{4m}{a^3}$$
  • $$\dfrac{2m}{a^3}$$
  • $$\dfrac{m}{a^3}$$
  • $$\dfrac{m}{4a^3}$$
Which metal among the following has the highest packing efficiency?
  • Iron
  • Tungsten
  • Aluminium
  • Polonium
Which among the following solids crystallises as a face centred cube?
  • Iron
  • Rubidium
  • Uranium
  • Platinum
The third layer in Figure - B:
481371_1673350d7d394101b847e5fa1343ca82.png
  • lie on tetrahedral voids of $$2^{nd}$$ layer
  • lie on octaheadral voids of $$2^{nd}$$ layer
  • both $$A$$ and $$B$$
  • none of the above
Glass is an example of this type of solid.
  • Amorphous solid
  • Ionic solid
  • Metallic solid
  • Molecular solid
Which of the following have a regular, repeated molecular pattern and large number of free surfaces in three dimensional space?
  • Solids and liquids
  • Liquids and gases
  • Solids
  • Gases
The packing efficiency of simple cubic $$(sc)$$, body centered cubic $$(bcc)$$ and cubic close packing $$(ccp)$$ lattices follows the order:
  • $$bcc < ccp < sc$$
  • $$ccp < bcc < sc$$
  • $$sc< ccp < bcc$$
  • $$sc < bcc < ccp$$

The ratio of cations to anion in a closed pack tetrahedral is:
  • 0.414
  • 0.225
  • 0.7302
  • none of these
Formula of unit cell density is:
  • $$\dfrac{ZM}{{a}^{3}{N}_{0}}$$
  • $$\dfrac{Z{N}_{0}}{{a}^{3}M}$$
  • $$\dfrac{{N}_{0}{a}^{3}}{MZ}$$
  • $$\dfrac{Z}{M{N}_{0}}$$
The name of the $$NaCl$$ crystal unit cell and its packing efficiency are respectively:
  • $$FCC$$ and $$74$$ %
  • $$BCC$$ and $$74$$ %
  • $$FCC$$ and $$68$$ %
  • $$FCC$$ and $$54$$ %
A gaseous mixture contains 56 g of $$N_2$$ , 44 g of $$CO_2$$ and 16 g of $$CH_4$$. The total pressure of the mixture is 720 mm of Hg. The partial pressure of methane is
  • 75 atm
  • 100 atm
  • 180 atm
  • 215 atm
What type of bonding results in compounds which are crystalline solids?
  • Covalent
  • Ionic
  • Metallic
  • Dipole-Dipole
Percentage of free space in a body centre cubic unit cell is:
  • $$30$$%
  • $$32$$%
  • $$34$$%
  • $$28$$%
The unit cell with crystallographic dimensions, $$a\ne b\ne c$$, $$\alpha=\gamma=90$$ and $$\beta\ne 90$$ is called :
  • triclinic
  • monoclinic
  • orthorhombic
  • tetragonal
The contribution of particle at the edge centre to a particular unit cell is :
  • $$\displaystyle\frac{1}{2}$$
  • $$\displaystyle\frac{1}{4}$$
  • $$1$$
  • $$\displaystyle\frac{1}{8}$$
The following image is a cross section of a solid crystal of Iodine $$(I_{2})$$.
What type of crystal is represented by this Iodine solid?
531805_d9937a88a2a748b7967ce19142f9a70b.png
  • Ionic Solid
  • Molecular Solid
  • Covalent Network Solid
  • Nonmetal Solid
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be :
  • 27u
  • 36u
  • 64u
  • 1u
Which of the following arrangements correctly represents hexagonal and cubic close packed structure respectively?
  • $$ABAB .......$$ and $$ABCABCABC ........$$
  • $$ABCABC .......$$ and $$ABAB ......$$
  • Both have $$ABCABC ......$$ arrangement
  • Both have $$ABAB .....$$ arrangement
In body-centred cubic structure, the space occupied is about :
  • 68%
  • 53%
  • 38%
  • 32%
P-type semi-conductors are made by mixing silicon with impurities of:
  • germanium
  • boron
  • arsenic
  • antimony
To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
Crystal structure of $$NaCl$$:
  • face centered cubic
  • body centered cubic
  • hexagonal
  • tetrahedral
The smallest repeating unit in space lattice which when repeated over and again results in the crystal of the given substance is called:
  • space lattice
  • crystal lattice
  • unit Cell
  • isomorphism
A metal has bcc structure and the edge length of its unit cell is $$3.04\dot{A}$$. The volume of the unit cell in $$cm^{3}$$ will be :
  • $$1.6\times 10^{21}cm^{3}$$
  • $$2.81\times 10^{-23}cm^{3}$$
  • $$6.02\times 10^{-23}cm^{3}$$
  • $$6.6\times 10^{-24}cm^{3}$$
Which kind of point defect is found in KCl crystal?
  • Frenkel
  • Schottky
  • Linear
  • Impurity
Which of the following crystal has unit cell such that $$a\neq b \neq c$$ and $$\alpha\neq \beta\neq \gamma \neq 90^o?$$
  • $$KNO_3$$
  • $$K_2SO_4$$
  • $$K_2Cr_2O_7$$
  • $$NaNO_3$$
In face centred cubic unit cell, what is the volume occupied?
  • $$\dfrac{4}{3}\pi r^3$$
  • $$\dfrac{8}{3}\pi r^3$$
  • $$\dfrac{16}{3}\pi r^3$$
  • $$\dfrac{64 r^3}{3\sqrt{3}}$$
Which of the following is correct regarding defect in solid?
  • Schottky defect has no effect on the physical properties of solids
  • Frenkel defect is usually favoured by a very small difference in the sizes of cations and anions
  • Frenkel defect is a dislocation defect
  • Trapping of protion in the lattice leads to the formation of F-centres
Which metal crystallises in a simple cubic structure?
  • Polonium
  • Copper
  • Nickel
  • Iron
In a face centred cubic arrangement of A and B atoms in which 'A' atoms are at the corners of the unit cell and 'B' atoms are at the face centres. One of the 'A' atom is missing from one corner in unit cell. The simplest formula of compound is :
  • $$A_7B_3$$
  • $$A_7B_8$$
  • $$AB_3$$
  • $$A_7B_{24}$$
The crystal lattice of NaCl is :
  • Face-centered Cubic lattice
  • Body-centered cubic lattice
  • Simple cubic lattice
  • Hexagonal close packing
The closest-packing sequence $$ABAB .....$$ represents
  • primitive cubic packing
  • body-centred cubic packing
  • face-centred cubic packing
  • hexagonal packing
Example of unit cell with crystallographic dimensions $$a\neq b \neq c, \alpha = \gamma = 90^{\circ}, \beta \neq 90^{\circ}$$ is:
  • Calcite
  • Graphite
  • Rhombic sulphur
  • Monoclinic sulphur
A match box exhibits:
  • Cubic geometry
  • Monoclinic geometry
  • Orthorhombic geometry
  • Tetragonal geometry
The formula for determination of density of a cubic unit cell is:
  • $$\dfrac {a^{3}\times N_{0}}{Z \times M}g\ cm^{-3}$$
  • $$\dfrac {Z\times N_{0}}{M \times a^{3}}g\ cm^{-3}$$
  • $$\dfrac {a^{3}\times M}{Z \times N_{0}}g\ cm^{-3}$$
  • $$\dfrac {Z\times M}{N_{0}\times a^{3}}g\ cm^{3}$$
Liquid crystal phase which are more close to the solid than to liquid is :
  • Nematic
  • Smectic
  • Lyotropioc
  • Cholesteric
Tetragonal crystal system has the following unit cell dimensions.
  • $$a = b = c$$ and $$\alpha = \beta = \gamma = 90^{\circ}$$
  • $$a = b \neq c$$ and $$\alpha = \beta = \gamma = 90^{\circ}$$
  • $$a \neq b \neq c$$ and $$\alpha = \beta = \gamma = 90^{\circ}$$
  • $$a = b \neq c$$ and $$\alpha = \beta = 90^{\circ}, \gamma = 120^{\circ}$$
The crystal system of a compound with unit cell dimensions $$a = 0.387, b = 0.387, c = 0.504\ nm$$ and $$\alpha = \beta = 90^{\circ}$$ and $$\gamma = 120^{\circ}$$ is:
  • cubic
  • hexagonal
  • orthorhombic
  • rhombohedral
Which of the following statements is not correct?
  • The number of carbon atoms in a unit cell of diamond is $$4$$
  • The number of Bravis lattices in which a crystal can be categorized in $$14$$
  • The fraction of the total volume occupied by the atoms in a primitive cell is $$0.48$$
  • Molecular solids are generally volatile
How many tetrahedral voids are occupied in diamond?
  • $$25$$%
  • $$50$$%
  • $$75$$%
  • $$100$$%
In which of the following type of lattices, the coordination number is 4?
  • BCC
  • Simple cubic
  • HCP
  • FCC
Close packing is maximum in the crystal lattice of
  • face-centred cubic
  • body-centred cubic
  • simple-centred cubic
  • none of these
A solid solution of $$CdBr_{2}$$ in $$AgBr$$ contains:
  • schottky defects
  • frenkel defects
  • colour centres
  • frenkel as well as schottky defects
The packing fraction of the element that crystallises in simple cubic arrangement is:
  • $$\dfrac {\pi}{4}$$
  • $$\dfrac {\pi}{6}$$
  • $$\dfrac {\pi}{3}$$
  • $$\dfrac {\pi}{2}$$
A certain sample of cuprous sulphide is found to have the composition $$Cu_{192}S_{100}$$ because of incorporation of $$Cu^{2+}$$ and $$Cu^+$$ ions in the crystal then ratio of $$Cu^{2+}$$ and $$Cu^{+}$$ ions is:  
  • 0.08 : 1.00
  • 1 : 23
  • 1 : 24
  • 1 : 1
The space occupied by spheres in bcc arrangement is
  • $$74$$%
  • $$70$$%
  • $$68$$%
  • $$60.4$$%
Shortest distance between two tetrahedral voids is:
  • $$a\sqrt {3}$$
  • $$\dfrac {a\sqrt {3}}{2}$$
  • $$\dfrac {a}{2}$$
  • $$\dfrac {a\sqrt {3}}{4}$$
Fraction of the total octahedral voids occupied will be:
655609_997553f7ef3a4274bb04695ebdfbf42a.jpg
  • $$\dfrac {1}{2}$$
  • $$\dfrac {1}{4}$$
  • $$\dfrac {1}{8}$$
  • $$\dfrac {1}{6}$$
The total volume of atoms present in a face-centered cubic unit cell of a metal is: $$(r$$ is atomic radius)
  • $$\dfrac {16}{3}\pi r^{3}$$
  • $$\dfrac {20}{3}\pi r^{3}$$
  • $$\dfrac {24}{3}\pi r^{3}$$
  • $$\dfrac {12}{3}\pi r^{3}$$
A metal crystallizes face-centered cubic lattice with the edge length of $$450\ pm$$. Molar mass of the metal is $$50\ g\ mol^{-1}$$. The density of metal will be:
  • $$2.64\ g\ cm^{-3}$$
  • $$3.64\ g\ cm^{-3}$$
  • $$4.64\ g\ cm^{-3}$$
  • $$2.68\ g\ cm^{-3}$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers