CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 1 - MCQExams.com

If A is the molecular mass of an element, a is the edge length and $$N$$ is the Avogadro's number, then the density for simple cubic lattice is :
  • $$\displaystyle\frac{2A}{Na^3}$$
  • $$\displaystyle\frac{4A}{Na^3}$$
  • $$\displaystyle\frac{A}{Na^3}$$
  • $$\displaystyle\frac{A}{Na^2}$$
Statement: The molecular orbitals in a crystalline solid are delocalised.

State whether the given statement is true or false.
  • True
  • False
Statement: Imperfection in solids give rise to new properties in it.

State whether the given statement is true or false
  • True
  • False
Statement: A cubic crystal possess all $$23$$ elements of symmetry.

State whether the given statement is true or false
  • True
  • False
Identify the amorphous substance from the following.
  • sugar
  • clay
  • salt
  • iron
An element A (atomic weight $$= 100$$ amu) having bcc structure has unit cell edge length of $$400$$ pm. Calculate the density of A.
  • $$2.59$$ g cm$$^{-3} $$
  • $$5.188$$ g cm$$^{-3} $$
  • $$10.37$$ g cm$$^{-3} $$
  • None of the above
Which of the following is a non-crystalline solid?
  • $$CsCl$$
  • $$NaCl$$
  • $$CaF_{2}$$
  • Glass
The lattice parameters,  $$a\neq b\neq c$$  and $$\alpha=\gamma=90^{\circ},\,\beta\neq 90^{\circ}$$ represents a :
  • tetragonal system
  • orthorhombic system
  • monoclinic system
  • triclinic system
Bravais lattices are of___________.
  • $$10$$ types
  • $$8$$ types
  • $$7$$ types
  • $$14$$ types
Diamond belongs to which of the following crystal system?
  • Cubic
  • Triclinic
  • Tetragonal
  • Hexagonal
The space occupied in bcc arrangement is_____________.
  • $$74\%$$
  • $$70\%$$
  • $$68\%$$
  • $$60\%$$
Which metal among the followings has the highest packing efficiency?
  • Iron
  • Tungsten
  • Aluminium
  • Polonium
The unit cell in a body centred cubic lattice is given in the figure. Each sphere has a radius, $$r$$ and the cube has a side, $$a$$.
What fraction of the total cube volume of empty?
654642_c8032412eacf4e2dbcb2e3cab675cc91.png
  • $$1 - \dfrac {8}{3} \pi \dfrac {r^{3}}{a^{3}}$$
  • $$\dfrac {4}{3}\cdot \pi \dfrac {r^{3}}{a^{3}}$$
  • $$\dfrac {r}{a}$$
  • $$2 - \dfrac {4}{3} \pi \dfrac {r^{3}}{a^{3}}$$
The closest-packing sequence $$ABC\ ABC .....$$ represents:
  • primitive cubic packing
  • body-centered cubic packing
  • face-centered cubic packing
  • hexagonal packing
If the temperature of 500 mL of air increases from 27°C to 42°C under constant pressure, then the increases in volume shall be
  • 15 mL
  • 20 mL
  • 25 mL
  • 30 mL
Mark the incorrect pair from the following.
  • Schottky defect- Equal number of cation and anions are missing.
  • Frenkel defect- Dislocation of cation from its normal site to interstitial site.
  • Impurity defect- $$CdCl_2$$ in $$AgCl$$ crystal to create cationic vacancy.
  • Metal excess defect- $$Fe_{0.93}O$$
Match the column I with column II and mark the appropriate choice.
Column I
(Structure)		Column II
(Packing efficiency)
(A)Simple cubic structure (i)68%
(B)Face centered cubic structure(ii)74%
(C)Body centered cubic structure(iii)52%
  • (A) $$\rightarrow $$ (iii), (B) $$\rightarrow $$ (ii), (C) $$\rightarrow $$ (i)
  • (A) $$\rightarrow $$(i), (B) $$\rightarrow $$ (ii), (C) $$\rightarrow $$ (iii)
  • (A) $$\rightarrow $$ (ii), (B) $$\rightarrow $$ (i), (C) $$\rightarrow $$ (iii)
  • (A) $$\rightarrow $$ (iii), (B) $$\rightarrow $$ (i), (C) $$\rightarrow $$ (ii)
Potassium has a bcc structure wit nearest neighbour distance $$4.52A^0$$, its atomic weight is $$39$$. Its density (in kg $$m^{-1}$$) will be:
  • $$454$$
  • $$804$$
  • $$852$$
  • $$908$$
A solid $$X^+Y^-$$ has a bcc structure. If the distance of closest approach between the two atoms is $$173$$ pm, the edge length of the cell is:
  • $$200$$ pm
  • $$\sqrt{3}/\sqrt{2}$$ pm
  • $$142.2$$ pm
  • $$\sqrt{2}$$ pm
Sodium crystallizes in the cubic lattice and the edge of the unit cell is $$ 430 pm$$. Calculate no of atoms in the unit cell.
[atomic mass of sodium = $$ 23.0$$ amu.
density of sodium = $$ 0.9623$$ g $$cm^{-3}$$.]
  • 4
  • 3
  • 2
  • 5
The atomic radius of metal crystallizing in fcc structure true is $$1.25A^o$$. Hence the volume occupied by atoms in cell crystal is:
  • $$4.078\times 10^{-22}cm^3$$
  • $$6.09\times 10^{-23}cm^3$$
  • $$3.27\times 10^{-23}cm^3$$
  • $$2.68\times 10^{-22}cm^3$$
Number of space lattices present in triclinic system is:
  • four
  • three
  • two
  • one
Which parameters are correct for unit cell of $$Na_{2}SO_{4}, 10H_{2}O$$ crystal?
  • $$a\neq b\neq c$$ and $$\alpha =\gamma =90^{o}, \beta \neq 120^{o}$$
  • $$a= b= c$$ and $$\alpha =\beta =\gamma = 90^{o}$$
  • $$a= b\neq c$$ and $$\alpha =\beta =\gamma = 90^{o}$$
  • $$a\neq b\neq c$$ and $$\alpha \neq \beta \neq \gamma =90^{o}$$ 
How many unit cells are present in a cube-shaped ideal crystal of $$NaCI$$ of mass $$1.00\ g$$?
  • $$5.14\times { 10 }^{ 21 }$$ unit cell
  • $$1.28\times { 10 }^{ 21 }$$ unit cell
  • $$1.71\times { 10 }^{ 21 }$$ unit cell
  • $$2.57\times { 10 }^{ 21 }$$ unit cell
The crystal structure of pure silicon is like:
  • Diamond
  • Graphite
  • Silver
  • Zinc
Which one of the following schemes of ordering close-packed sheets of equal-sized spheres do not generate close-packed lattice?
  • $$ABACABAC.....$$
  • $$ABCBCABC....$$
  • $$ABCABC....$$
  • $$ABBAA....$$
The correct order of matching of the following compounds is:
List- $$I$$List - $$II$$
Borazole$$CaSO_{4}.1/2 H_{2}O$$
Plaster of paris$$C_{60}$$
Boric acid$$SiO_{2}$$
Quartz$$B_{3}N_{3}H{6}$$
Buckminstersullerene$$H_{3}BO_{3}$$
  • $$A-3, B-1, C-2, D-5, E-4$$
  • $$A-1, B-5, C-3, D-4, E-2$$
  • $$A-5, B-2, C-1, D-3, E-4$$
  • $$A-4, B-1, C-5, D-3, E-2$$
  • $$A-4, B-1, C-5, D-2, E-3$$
The empty space left between the spheres in closed packed structure is called voids. The decreasing order of the size of voids is
  • cubic > octahedral > tetrahedral > trigonal
  • octahedral > tetrahedral > trigonal > cubic
  • tetrahedral > trigonal > cubic > octahedral
  • trigonal > cubic > octahedral > tetrahedral
Which one is an example of amorphous solid?
  • Glass
  • Salt
  • Cesium chloride
  • Calcium fluoride
Space lattice of $$CaF_{2}$$ is:
  • Face centred cubic
  • Body centred cubic
  • Simple cubic
  • Hexagonal closed packing
Structure similar to zinc blende is found in:
  • $$AgCl$$
  • $$NaCl$$
  • $$CuCl$$
  • $$TlCl$$
How many space lattices are obtainable from the different crystal systems?
  • $$7$$
  • $$14$$
  • $$32$$
  • $$230$$
The close packing represents $$ABC\ ABC ....$$ order of:
  • Body centred cubic packing
  • Face centred cubic packing
  • Simple cubic packing
  • Hexagonal cubic closed packing
What type of lattice is found in potassium chloride crystal?
  • Face centred cubic
  • Body centred cubic
  • Simple cubic
  • Simple tetragonal
The number of atoms present in a hexagonal close-packed unit cell is :
  • $$4$$
  • $$6$$
  • $$8$$
  • $$12$$
The unit cell present in ABCABC, closest packing of atoms is :
  • hexagonal
  • tetragonal
  • face centered cube
  • primitive cube
Ferrous oxide has a cubic structure and edge length of the unit cell is $$5.0 \,\mathring {A}.$$ Assuming the density of ferrous oxide to be $$3.84 \,g/cm^3,$$ the no. of $$Fe^{2+}$$ and $$O^{2-}$$ ions present in each unit cell be : $$(use : N_{A} = 6 \times 10^{23})$$ :
  • $$4Fe^{2+}$$ and $$4O^{2-}$$
  • $$2Fe^{2+}$$ and $$2O^{2-}$$
  • $$1Fe^{2+}$$ and $$1O^{2-}$$
  • $$3Fe^{2+}$$ and $$4O^{2-}$$
The unit cell present in ABAB, closest packing of atoms is :
  • hexagonal
  • tetragonal
  • face centered cube
  • primitive cube
Statement 1: In a crystal of $$Ca$$, the separation of $$(1,1,1)$$ planes is twice as great as that of $$(2,2,2)$$ planes.
Statement 2: The length of the side of crystal lattice is $$0.556$$ nm $$(\sqrt{12}=3.46)$$.
  • Statement 1 is True, Statement 2 is True, Statement 2 is a correct explanation of Statement 1.
  • Statement 1 is True, Statement 2 is True, Statement 2 is not a correct explanation of Statement 1.
  • Statement 1 is True, Statement 2 is False.
  • Statement 1 is False, Statement 2 is True.
The statements that are true for clathrates are :
  • helium and neon can form clathrates
  • In clathrates, the rare gas molecules are entrapped by cages of water, phenol or quinol
  • clathrate molecules are formed using weak Van der Walls' forces
  • stability of clathrated decreases with increase in atomic mass of the rare gas atoms
The space lattice of diamond is:
  • fcc
  • bcc with two atoms per unit cell
  • bcc with 4 atoms per unit cell
  • simple cubic
Which of the following about the above structure is incorrect?
933439_024f972163bf4075a0984b03e2629ef6.PNG
  • It has $$ccp$$ structure.
  • Each $$X$$ ion is surrounded by eight $$Y$$ ions.
  • The structure is similar to diamond.
  • $$X$$ ions are present at the corner of the cube and center of each face.
Empty space in ccp lattice is
  • $$26$$%
  • $$45$$%
  • $$90$$%
  • $$30$$%
Diamond shows ___________ lusture.
  • adamantine
  • resinous
  • pearly
  • translucent
Which of the following compounds would be a white, crystalline solid?
  • $$\displaystyle { C }_{ 3 }{ H }_{ 8 }$$
  • $$\displaystyle CO$$
  • $$\displaystyle Cu{ Cl }_{ 2 }$$
  • $$\displaystyle { Cr }_{ 2 }{ O }_{ 3 }$$
  • $$\displaystyle MgO$$
Packing efficiency in a unit cell is never 100% because constituent particles are assumed to be:
  • Spheres
  • Cuboid
  • Cubes
  • Conical
Identify the system of crystal structure, if a = b $$\neq$$ c and $$\alpha = \beta = 90^{\circ}$$ and $$\gamma = 120^{\circ}$$
  • Monoclinic
  • Triclinic
  • Hexagonal
  • Rhombohedral
Solids with regular pattern are called______and irregular pattern are called_______.
  • crystalline, amorphous
  • amorphous, crystalline
  • amorphous, metallic
  • non-metallic, crystalline

Lattice energy is defined as the energy released when 1 mol of an ionic solid is formed from its ions in the gaseous phase. From the following given compounds, the lattice energy is maximum for (compare the only magnitude)
  • $$N{a_2}O$$
  • NaF
  • $$Mg{F_2}$$
  • $$MgC{l_2}$$
The radius of a calcium ion is 94 pm and of the oxide, the ion is 146 pm. The possible crystal structure of calcium oxide will be:- 
  • octahedral
  • tetrahedral
  • pyramidal
  • trigonal
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