CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 14 - MCQExams.com

Match the defects given in column I with statements given in column II and mark the appropriate choice.

Column I
Column II
(A)Simple vacancy defect(i)Shown by non-ionic solids and increases the density of the solid.
(B)Simple interstitial defect(ii)Shown by ionic solution and decreases the density of the solid
(C)Frenkel defect(iii)Shown by non-ionic solids and decreases the density of the solid
(D)Schottky defect(iv)Shown by ionic solids and density of the solid remains the same
  • (A)$$\rightarrow$$(iv), (B)$$\rightarrow$$(iii), (C)$$\rightarrow$$(ii), (D)$$\rightarrow$$(i)
  • (A)$$\rightarrow$$(iii), (B)$$\rightarrow$$(iv), (C)$$\rightarrow$$(i), (D)$$\rightarrow$$(ii)
  • (A)$$\rightarrow$$(iii), (B)$$\rightarrow$$(i), (C)$$\rightarrow$$(iv), (D)$$\rightarrow$$(ii)
  • (A)$$\rightarrow$$(i), (B)$$\rightarrow$$(iii), (C)$$\rightarrow$$(iv), (D)$$\rightarrow$$(ii)
Packing fraction in diamond is (approximately)
  • $$74\%$$
  • $$78\%$$
  • $$68\%$$
  • $$34\%$$
Packing fraction in $$2D-$$hexagonal arrangement of identical sphere is 
  • $$\dfrac{\pi}{3\sqrt {2}}$$
  • $$\dfrac{\pi}{3\sqrt {3}}$$
  • $$\dfrac{\pi}{2\sqrt {3}}$$
  • $$\dfrac{\pi}{6}$$
If oxidation states of A , B  and C respectively are $$+2, +3$$ and $$-2$$ then the possible formula of the compound is
  • $$A_3(B_2C)_2$$
  • $$A_2(BC)_3$$
  • $$B_3(AC_3)_2$$
  • $$A_3(BC_3)_2$$
The pink colour of lithium chloride crystal is due to:
  • frenkel defect
  • metal excess defect
  • metal deficiency defect
  • impurity defect
Select correct for given arrangement.
1024089_f911080c7c6a4a7da3cbbb8baab466cf.png
  • It has $$3$$ tetrahedron
  • Each tetrahedron share its two vertex with other tetrahedron
  • It is observed in $$\gamma -SO_3$$
  • It has a six member ring
Molybdenum (At. wt. $$= 96 \ g/mol$$) crystallizes as $$bcc$$ crystal. If density of crystal is $$10.3 \ g/cm^3$$, then radius of $$Mo$$ atom is: [Use : $$\,N_A = 6 \times 10^{23}$$]
  • $$111$$pm
  • $$314$$pm
  • $$135.96$$pm
  • none of these
In fcc, a tetrahedral void is formed by atoms at
  • 3 corners and 1 face centre
  • 3 face centres and 1 corner
  • 2 face centres and 2 corners
  • 2 face centres, 1 corner and 1 body centre
The unit cell with the structure above refer to which crystal system?

1006383_9abb6555980c4501a3e0956261ab302d.png
  • Cubic
  • Orthorhombic
  • Tetragonal
  • Trigonal
$$KF$$ has $$NaCl$$ structure. What is the distance (in $$A^o$$) between $$K^+$$ and $$F^-$$ in $$KF$$, if density of $$KF$$ is $$2.48$$ $$gm/cm^3$$? $$[K=39, F=19]$$
  • $$2.86$$
  • $$2.68$$
  • $$3.16$$
  • $$3.68$$
Radii of $$A^+$$ and that of $$X^-$$ and $$Y^-$$ have been given as
$$A^+=1.00$$ pm
$$X^-=1.00$$ pm
$$Y^-=2.00$$ pm
Determine the volume of unit cells of AX and AY crystals.
  • $$123.2\times10^{-36} m^3, 2160\times10^{-36} m^3$$
  • $$12.32\times10^{-36} m^3, 216\times10^{-36} m^3$$
  • $$22.62\times10^{-36} m^3, 76.36\times10^{-36} m^3$$
  • $$93.23\times10^{-36} m^3, 142\times10^{-36} m^3$$
Packing fraction in a body-centered cubic cell of crystals is:
  • $$\frac{{\sqrt 3 }}{8}\pi $$
  • $$\frac{\pi }{6}$$
  • $$\frac{{\sqrt 2 }}{6}\pi $$
  • $$\frac{1}{{3\sqrt 2 }}\pi $$
Aluminium crystallizes in a cubic close packed structure. Its metallic radius is $$125pm$$.
i) Calculate the edge length of unit cell
ii) How many unit cells are there in $$1.00cm^3$$ of aluminium?
  • $$354 pm, 2.41\times 10^{22}$$
  • $$355 pm, 3.41\times 10^{20}$$
  • $$356 pm, 4.41\times 10^{21}$$
  • $$357 pm, 5.41\times 10^{23}$$
$$AB$$ has $$NaCl$$ structure while $$XB$$ has $$CsCl$$ structure if $${ r }_{ A }|{ r }_{ B }=\ 5$$ and $${ r }_{ X }|{ r }_{ B }= 0.75$$ then what is the ratio of edge length of unit cell of $$AB$$ and $$XB$$.
  • $$1.52$$
  • $$1.50$$
  • $$1.40$$
  • $$0.85$$
The density of $$Ca{F_2}$$ (fluorine structure) is $$3.18$$g /$${cm^{3}}$$. The length of the side of the unit cell is:
  • $$253$$pm
  • $$344$$pm
  • $$546$$pm
  • $$273$$pm
In a solid lattice, the cation has left a lattice site and is located at interstitial position, the lattice defect is ____
  • Interstitial defect
  • Vacancy defect
  • Frenkel defect
  • Schottky defect
The number of octahedral voids present in 234 g of NaCl is:
  • $$N_{A}$$
  • $$4N_{A}$$
  • $$16N_{A}$$
  • $$\cfrac{N_{A}}{4}$$
Crystal $$AB$$ shows $$ZnS$$ (zinc blend) type structure if the radius of $$B^{-}$$ in $$50\ pm$$ then the radius of $$A^{+}$$, if edge length of unit cell is $$160\ pm$$.
  • $$11.25\ pm$$
  • $$27.94\ pm$$
  • $$15.25\ pm$$
  • $$19.28\ pm$$
In a solid $$AB$$ having $$NaCl$$ structure atoms, occupy the corners of the unit cell. If all the face centred atoms along one of the axis are removed, then the resultant stoichiometry of the solid is:
  • $$AB_2$$
  • $$A_2B$$
  • $$A_4B_3$$
  • $$A_3B_4$$
Which of the following has face-centred Bravais lattice?
  • Hexagonal
  • Monoclinic
  • Cubic
  • Orthorhombic
The ratio of a number of rectangular planes and diagonal plane in a cubic unit cell is ____.
  • $$1 : 2$$
  • $$3 : 1$$
  • $$2 : 3$$
  • $$3 : 4$$
A CCP of $$n$$ spheres of radius $$r$$, $$n$$ spheres of radius $$0.414\, r$$ and $$2n$$ spheres of radius $$0.225\, r$$ are introduced in the octahedral and tetrahedral void respectively. Therefore packing of the lattice is:
  • $$0.74$$
  • $$0.81$$
  • $$0.86$$
  • $$0.79$$
Select right expression for determining Packing fraction (P.F.) of NaCl unit cell (assume ideal), if ions along an edge diagonal are absent ?
  • $$P.F. = \dfrac{\dfrac{4}{3}\pi(r_+^3 +r_-^3)}{16\sqrt{2}r_-^3}$$
  • $$P.F. = \dfrac{\dfrac{4}{3}\pi(\dfrac{5}{2}r_+^3 +4r_-^3)}{16\sqrt{2}r_-^3}$$
  • $$P.F. = \dfrac{\dfrac{4}{3}\pi(\dfrac{5}{2}r_+^3 +r_-^3)}{16\sqrt{2}r_-^3}$$
  • $$P.F. = \dfrac{\dfrac{4}{3}\pi(\dfrac{7}{2}r_+^3 +r_-^3)}{16\sqrt{2}r_-^3}$$
Arrange the following in decreasing order of melting point: $$NaCl,SiO_{2},Dry    Ice, Ice$$ 
  • $$NaCl>SiO_{2}>Dry Ice>Ice$$
  • $$SiO_{2}>NaCl>Dry
    Ice>Ice$$
  • $$NaCl>SiO_{2}>Ice>Dry
    Ice$$
  • $$SiO_{2}>NaCl>Ice>Dry
    Ice$$
The number of parameters that defines a unit cell is 
  • 2
  • 3
  • 4
  • 6
Match the column 1 correctly with the column 2 given below
1181731_56199379892c499eaac5bd75805b21c1.jpg
  • A=2 B=1 C=3 D=4
  • A=3 B=1 C=4 D=2
  • A=3 B=2 C=1 D=4
  • A=1 B=2 C=3 D=4
Given length of side of hexagonal unit cell is $$\dfrac { 100 }{ \sqrt { 2 }  } $$ pm. The volume of hexagonal unit cell is (in pm$$^{ 3 }$$):
  • $${ 8\times 10 }^{ 6 }$$
  • $${ 1.5\times 10 }^{ 6 }$$
  • $${ 64\times 10 }^{ 6 }$$
  • $${ 36\times 10 }^{ 6 }$$
Amorphous solids are those which have:
  • fixed arrangement of atoms and molecules
  • no fixed melting point
  • regular geometry
  • no of the above
The ratio of the volume of tetragonal lattice to that of a hexagonal lattice is?
  • $$\frac { \sqrt { 3 } }{ 2 } abc$$
  • $$\frac { 2 }{ \sqrt { 3 } } $$
  • $$\frac { 2a^ 2 }{ \sqrt { 3b } } c$$
  • $$\frac { \sqrt { 3a^ 2 } }{ 2bc } $$
The incorrect statement among the following is:
  • The fraction of total volume occupied by the atoms in a primitive cell is 0.48.
  • Molecular solids are generally volatile.
  • The number of carbon atoms in an unit cell of diamond is 8.
  • The number of Bravais lattices in which a crystal can be categorized is 14.
CsBr crystallises in a body centred cubic lattice.The until cell length is 436.6pm.Given that the atomic mass of Cs=133 and that of Br=80 amu and Avogadro number being $$ 6.02\times { 10 }^{ 23 } { mol }^{ -1 }$$,the density of $$CsBr$$ is:
  • $$8.25{ g }/{ { cm }^{ 3 } }$$
  • $$4.25{ g }/{ { cm }^{ 3 } }$$
  • $$42.5{ g }/{ { cm }^{ 3 } }$$
  • $$0.425{ g }/{ { cm }^{ 3 } }$$
The close-packing sequence ABAB____represents:
  • SC packing
  • FCC packing
  • Hexagonal packing
  • BCC packing
An element crystallizing in the three Bravais Cubic lattices, the ratio of densities $$ \rho_{P}: \rho_{1}: \rho_{F}$$ is:
  • 0.125 : 0.163 : 0.177
  • 0.125 : 0.177 : 0.163
  • 0.177 :0.163 : 0.125
  • 0.163 :0.177 : 0.125
Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of $$390$$ pm. If the size of chloride ion is $$180$$ pm, the size of ammonium ion would be:
  • $$158$$ pm
  • $$174$$ pm
  • $$142$$ pm
  • $$126$$ pm
Schottky defect is observed in the crystal of:
  • $$AgCl$$
  • $$NaCl$$
  • $$MgCl_2$$
  • $$TiCl$$
An element exists as hexagonal close packed structure as well as cubic closed packed structure. In which case the element would have higher density?
  • CCP
  • HCP
  • Same in both
  • Unpredictable
Which of the following is /are found in the solid state?
  • $$\mathrm { LiHCO } _ { 3 }$$
  • $$\mathrm { KHCO } _ { 3 }$$
  • $$\mathrm { NaHCO } _ { 3 }$$
  • $$\mathrm { NH } _ { 4 } \mathrm { HCO } _ { 3 }$$
Maximum possible numbers of two dimensional and three dimensional lattices are respectively __________.
  • 5 and 14
  • 7 and 14
  • 14 and 4
  • 5 and 13
In FCC crystal, which of the following shaded planes the following type of arrangement of atoms
1206284_1ba780657f294ff18838fbc552594842.png
Crystalline allotrope of silicon has:
  • Diamond like structure
  • Graphite like structure
  • fullerene like structure
  • $$s{p^2}$$ hybridization
What is the packing efficiency of arrangement in a body centred unit cell?
  • $$53.26\%$$
  • $$74.00\%$$
  • $$68.00\%$$
  • $$64.00\%$$
Sodium crystallises in bcc arrangement with the interfacial sepration between the atoms of the edge $$53 pm$$. The density of the solid is :
  • $$1.23 g/cc$$
  • $$485 g/cc$$
  • $$4.85 g/cc$$
  • $$123 g/cc$$
Consider the bcc unit cells of the solids $$1$$ and $$2$$ with the position of atoms as shown below. The radius of atom $$B$$ is twice that of atom $$A$$. The unit cell edge length is $$50 \%$$ more in solid $$2$$ than in $$1$$. What is the approximate packing efficiency in solid $$2$$?
1614066_9f03f82e7eea4f6b9e4e6b9f1d36f320.png
  • $$45 \%$$
  • $$65 \%$$
  • $$90 \%$$
  • $$75 \%$$
Select the correct statement related to hexagonal close packing of identical spheres in three dimensions.
  • In one unit cell, there are 12 octahedral voids and all are completely inside the unit cell.
  • In one unit cell, there are six octahedral voids and all are completely inside the unit cell.
  • The number of atoms per unit cell in hcp are 12
  • Coordination number of every sphere is 8
Select the correct statement(s) related to hexagonal close packing of identical spheres in three dimensions.
  • In one unit cell, there are 12 octahedral voids and all are completely inside the unit cell
  • In one unit cell, there are six octahedral voids and all are completely inside the unit cell
  • In one unit cell, there are six octahedral void and of which three are completely inside the unit cell and other three are partially inside the unit cell
  • Co-ordination number of every sphere is 12 in hcp lattice.
In a cubic lattice if atoms are present only at all the corners and alternate face centres then the packing efficiency will be:
  • $$74 \%$$
  • $$37\%$$
  • $$68\%$$
  • Cannot be determined
Crystals of different ionic compounds having similar arrangement of ions as well as geometry are known:
  • Isomorphs
  • Isomers
  • Anomers
  • Isotopes
A lattice is defined as
  • the amount of energy required, per mole, to separate the ions from their lattice positions to an infinte distance in the gas phase
  • the distance separating the cations and anions
  • a set of all points with identical environments within crystal
  • the arrangement of electrons in various energy levels
Packing fraction in FCC lattice is
  • $$\cfrac { 1 }{ 6 } \pi \quad $$
  • $$\cfrac { \sqrt { 2 } }{ 6 } \pi $$
  • $$\cfrac { \sqrt { 3 } }{ 8 } \pi \quad $$
  • $$\cfrac { \sqrt { 2 } }{ 3 } \pi $$
Sodium oxide as anti-fluorite structure. The percentage of the tetrahedral voids occupied by the sodium ions is
  • $$12$$%
  • $$25$$%
  • $$50$$%
  • $$100$$%
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