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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 :
  • 2ANa3
  • 4ANa3
  • ANa3
  • ANa2
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 cm3
  • 5.188 g cm3
  • 10.37 g cm3
  • None of the above
Which of the following is a non-crystalline solid?
  • CsCl
  • NaCl
  • CaF2
  • Glass
The lattice parameters,  abc  and α=γ=90,β90 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
  • 183πr3a3
  • 43πr3a3
  • ra
  • 243πr3a3
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- CdCl2 in AgCl crystal to create cationic vacancy.
  • Metal excess defect- Fe0.93O
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) (iii), (B) (ii), (C) (i)
  • (A) (i), (B) (ii), (C) (iii)
  • (A) (ii), (B) (i), (C) (iii)
  • (A) (iii), (B) (i), (C) (ii)
Potassium has a bcc structure wit nearest neighbour distance 4.52A0, its atomic weight is 39. Its density (in kg m1) 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
  • 3/2 pm
  • 142.2 pm
  • 2 pm
Sodium crystallizes in the cubic lattice and the edge of the unit cell is 430pm. Calculate no of atoms in the unit cell.
[atomic mass of sodium = 23.0 amu.
density of sodium = 0.9623 g cm3.]
  • 4
  • 3
  • 2
  • 5
The atomic radius of metal crystallizing in fcc structure true is 1.25Ao. Hence the volume occupied by atoms in cell crystal is:
  • 4.078×1022cm3
  • 6.09×1023cm3
  • 3.27×1023cm3
  • 2.68×1022cm3
Number of space lattices present in triclinic system is:
  • four
  • three
  • two
  • one
Which parameters are correct for unit cell of Na2SO4,10H2O crystal?
  • abc and α=γ=90o,β120o
  • a=b=c and α=β=γ=90o
  • a=bc and α=β=γ=90o
  • abc and αβγ=90o 
How many unit cells are present in a cube-shaped ideal crystal of NaCI of mass 1.00 g?
  • 5.14×1021 unit cell
  • 1.28×1021 unit cell
  • 1.71×1021 unit cell
  • 2.57×1021 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- IList - II
BorazoleCaSO_{4}.1/2 H_{2}O
Plaster of parisC_{60}
Boric acidSiO_{2}
QuartzB_{3}N_{3}H{6}
BuckminstersullereneH_{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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