CBSE Questions for Class 12 Engineering Chemistry The Solid State Quiz 3 - MCQExams.com

Which of the following parameters are correct for triclinic lattice?
  • $$\alpha = \beta = \gamma = 9 ^ { \circ }$$ and $$ a = b = c$$
  • $$\alpha \neq \beta \neq \gamma \neq 90 ^ { \circ } \text { and } a \neq b \neq c$$
  • $$\alpha = \gamma = 90 ^ { \circ } , \beta \neq 90 ^ { \circ } \text { and } a \neq b \neq c$$
  • $$\alpha = \beta = \gamma = 90 ^ { \circ } \text { and } a \neq b \neq c$$
A solid ABC has A, B and C arranged as below. The formula of solid is:
1531204_5dba7e734f0843bd904937281d90d83b.JPG
  • $$ABC$$
  • $${ AB }_{ 2 }{ C }_{ 2 }$$
  • $${ A }_{ 2 }B{ C }$$
  • $${ A }B_{ 8 }{ C }_{ 2 }$$
Select the correct statement (s) :
  • The ionic crystal of $$AgBr$$ may have Schottky defect.
  • The unit cell having crystal parameters, $$a=b\neq c,\alpha =\beta ={ 90 }^{ \circ },\gamma ={ 120 }^{ \circ }$$ is hexagonal.
  • In ionic compounds having Frankel defect the ratio $${ r }^{ + }/{ r }^{ - }$$ is high.
  • The co-ordination of $${ Na }^{ + }$$ ion in $$NaCl$$ is 6.
Copper atoms are living on 8 corners and silver atoms on 6 faces while gold at body centre. Find the formula 
  • $$ CuAg_3Au $$
  • $$ Cu_3Au_3Ag $$
  • $$ CuAgAu $$
  • $$ Cu_2AuAg $$
Edge length is 200$$\mathrm { pm }$$ in body-centred unit cell what will be the radius of atom in pm?
  • 139
  • 150
  • 86.6
  • 93.4
The limiting radius ratio of the complex $${ \left[ Ni{ \left( CN \right)  }_{ 4 } \right]  }^{ 2- }$$ is
  • 0.225-0.414
  • 0.414-0.732
  • 0.155-0.225
  • None of these
A metal crystallizes in a face-centered cubic structure. If the edge length of its unit cell is 'a' the closest approach between two atoms in a metallic crystal will be:
  • $$ \sqrt{2} a $$
  • $$ \dfrac{a}{\sqrt{2}} $$
  • $$2 a $$
  • $$2 \sqrt{2}{a} $$
Which of the following is the only incorrect statement regarding amorphous solids?
  • On heating, they may become crystalline at some temperature
  • They may become crystalline on keeping for long time
  • Amorphous solids can be molded by heating
  • They are anisotropic in nature
CCP is also called as : 
  • FCC
  • BCC
  • Primitive
  • HCP
Which of the following characteristic features match(es) with the crystal systems: hexagonal and monoclinic?
  • Both have the cell parameters; $$a=b=c$$ and $$\alpha =\beta =\gamma$$
  • Both belong to different crystal systems
  • Both have only two crystallographic angles of $$90^o$$
  • Both belong to same crystal system
In $$AgBr$$ crystal, the ion size lies in the order $$Ag^{+} < < Br^{-}$$. The $$AgBr$$ crystal should have:
  • Defectless (perfect) crystal
  • Schottky defect only
  • Frenkel defect only
  • Both Schottky and Frenkel defects
In a closed packed structure, if $$r$$ is the radius of the spherical void and $$R$$ is the radius of the spheres forming voids, the critical $$r /R$$ value of the tetrahedral void is equal to
  • $$0.155$$
  • $$0.255$$
  • $$0.414$$
  • $$0.732$$
The crystal lattice of ice is mostly formed by : 
  • ionic forces
  • covalent bonds
  • intramolecular H-bonds
  • covalent as well as H-bonds
The body centered cubic cell of chromium has a length of $$0.288 \,nm.$$ Calculate the density of chromium $$(g / cm^3)$$ : (Atomic weight : $$Cr = 52.0$$)
  • $$6.80$$
  • $$7.60$$
  • $$6.60$$
  • $$7.23$$
The fraction of volume occupied by atoms in a body centered cubic unit cell is:
  • $$0.32$$
  • $$0.48$$
  • $$0.68$$
  • $$0.74$$
Choose the correct statement about the given figures.
1843661_1d1a5ee5757940179fbb04c458c43edb.png
  • $$(II)$$ represents solid state while $$(III)$$ represent liquid state.
  • $$(II)$$ represents solid state while $$(III)$$ represent solid state.
  • $$(I)$$ represents solid state while $$(III)$$ represent liquid state.
  • $$(I)$$ represents solid state while $$(III)$$ represent solid state.
Complete the given table:

1845162_efeb66b7dd434c1ab982bd62eff5cb47.png
  • $$A$$ - Impurity Defect ; $$B$$ - Stoichiometric Defect ; $$C$$ - Non-Stoichiometric Defect ; $$D$$ - Anion Excess Defect
  • $$A$$ - Stoichiometric Defect ; $$B$$ - Non-Stoichiometric Defect ; $$C$$ - Impurity Defect ; $$D$$ - Metal Excess Defect
  • $$A$$ - Non-Stoichiometric Defect ; $$B$$ - Stoichiometric Defect ; $$C$$ - Impurity Defect ; $$D$$ - Cation Defect
  • $$A$$ - Impurity Defect ; $$B$$ - Stoichiometric Defect ; $$C$$ - Metal Excess Defect ; $$D$$ - Non-Stoichiometric Defect
Which is the effect represented by the given figure?
1845088_e266d7cb64da4c6baa9348d23d46c899.png
  • Schottky defect
  • Frenkel defect
  • Vacancy defect
  • Interstitial defect
The fraction of volume occupied by atoms in a face centered cubic unit cell is :
  • $$0.32$$
  • $$0.48$$
  • $$0.68$$
  • $$0.74$$
Which of the following crystal lattice has the minimum empty space ?
  • Simple cubic
  • Body centered cubic
  • Face centered cubic
  • Simple tetragonal
The crystal system of a compound with unit cell parameters,
$$a = 0.328 \,nm, b = 0.328 \,nm, c = 0.527 \,nm$$ and $$\alpha = \beta = \gamma = 90^\circ$$ is :
  • Cubic
  • Tetragonal
  • Monoclinic
  • Rhombohedral
Dopping of $$AgCl$$ crystals with $$CdCl_{2}$$ results in:
  • Schottky defect
  • Frenkel defect
  • Substitutional cation vacancy
  • Formation of F-centres
Structure shown here represents :
1859398_79383692cd2544b38ea934b2d6ebebbb.png
  • Schottky defect
  • Frenkel defect
  • Both defects
  • None of these
The radius of a divalent cation $$A^{2+}$$ is $$94 \,pm$$ and that of a divalent anion $$B^{2-}$$ is $$146 \,pm$$. The compound $$AB$$ has a/an :
  • Rock salt structure
  • Zinc blende structure
  • Antifluorite structure
  • Caesium chloride like structure
An element crystallizes in a structure having fcc unit cell of an edge $$200 \,pm.$$ Calculate the density, if $$100 \,g$$ of this element contains $$12 \times 10^{23}$$ atoms:
  • $$41.66 \,g/cm^3$$
  • $$4.166 \,g/cm^3$$
  • $$10.25 \,g/cm^3$$
  • $$1.025 \,g/cm^3$$
one or more answers is / are correct.
Select the correct statement(s):
  • The co-ordination number of each type of ion in a CsCl crystal is twelve
  • A metal that crystallizes in a bcc structure has a co-ordination number of twelve
  • A unit cell of an ionic crystal shares some of its ions with other unit cells
  • The length of the unit cell in NaCl in $$552$$ pm (given that $$r_{Na^+} = 85\,pm$$ and $$r_{Cl^-} = 181\,pm$$)
If the same type of atoms are packed in hexagonal closest packing (hcp) and cubical closest packing(ccp) separately, then: 
  • Density of hcp will be greater than ccp
  • Density of hcp will be smaller than ccp
  • Density of hcp will be equal to ccp
  • Density of hcp may be equal or greater than ccp depending upon the temperature of the system.
Which one is an amorphous solid?
  • Diamond
  • Graphite
  • Common salt
  • Glass
ZnS crystallises in a cubic structure in which $$Zn^{2+}_{ions}$$ occupy half of tetrahedral voids while $$S^{2 -}$$ ions occupy all corners and face centres. Hence the number of ZnS molecules present in 4 unit cells are 
  • 12
  • 16
  • 18
  • 24
A metallic element exists as cubic lattice. Each edge of the unit cell is $$  2.88 \mathring {A} .$$ The density of the metal is $$ 7.20\ g cm^{-3}.$$ How many unit cell will be present in 100 g of the metal?
  • $$ 6.85 \times 10^2 $$
  • $$ 5.82 \times 10^{23} $$
  • $$ 4.37 \times 10^5 $$
  • $$ 2.12 \times 10^6 $$
$$KF$$ has $$NaCl$$ structure. The edge length of its unit cell has been found to be $$537.6\ pm$$. The distance between $$K^{+}$$ and $$F^{-}$$ in $$KF$$ is :
  • $$537.6 \ pm$$
  • $$268.8\ pm$$
  • $$107.5\ pm$$
  • $$Cannot\ be\ calculated$$
Which of the following solids have tetragonal crystal system
  • $$NaCl$$
  • $$ZnS$$
  • $$TiO_{2}$$
  • $$ZnO$$
In orthorhombic, the value of $$a, b$$ and $$c$$ are respectively $$4.2\ A$$, $$8.6\ A$$ and $$8.3\ A$$.Given the molecular mass of the solute is $$155\ gm\ mol^ {-1}$$ and that of density is $$3.3\ gm\ cc$$ the number of formula units per unit cell is
  • $$2$$
  • $$3$$
  • $$4$$
  • $$6$$
Which of fallowing has different structure than other?
  • NaCl
  • LiCl
  • RbCl
  • CsCl
How many types of crystalline solids are found?
  • $$2$$
  • $$6$$
  • $$4$$
  • none of these
Which of the following is correct?
  • Crystal system $$ \rightarrow $$ Cubic;
    Axial distance $$ \rightarrow $$ a=b=c;
    Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
    Examples $$ \rightarrow $$ $$Cu,KCl$$
  • Crystal system $$ \rightarrow $$ Monoclinic$$ \rightarrow $$ ; Axial distance $$ \rightarrow $$ a=b=c ;
    Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
    Examples $$ \rightarrow $$ $$ PbCrO_2, PbCrO_4 $$
  • Crystal system $$ \rightarrow $$ Rhomboherdal; Axial distance $$ \rightarrow $$ a = b = c;
    Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
    Example $$ \rightarrow $$ $$ CaCO_3 $$
  • Crystal system $$ \rightarrow $$ Triclinic; Axial distance $$ \rightarrow $$ a = b = c;
    Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
    Examples $$ \rightarrow $$ $$ K_2Cr_2O_7, CuSO_4.5H_2O $$
The unit cell has an edge length 403 pm.The distance between two atoms placed opposite ends of body diagonal will be :
  • 8.6 pm
  • 201.5 pm
  • 698 pm
  • 578 pm
Edge length of a cubic unit cell is 354 pm,The distance between two atoms diagonally opposite on the face is
  • 500 pm
  • 354 pm
  • 700 pm
  • 627 pm
Edge length of a cube is 400 pm, its body diagonal would be
  • 500 pm
  • 600 pm
  • 566 pm
  • 693 pm
Which of the following has highest lattice energy?
  • NaCl
  • $$MgCl_2$$
  • KCl
  • $$BaCl_2$$
How many unit cells of KBr are present in a 1.00$${ mm }^{ 3 }$$  grain of KBr,KBr crystallizes in NaCl type of crystal lattice and its density is 2.75g/$${ cm }^{ 3 }$$?
  • 3.6$$\times \quad { 10 }^{ 18 }$$
  • 3.6$$\times \quad { 10 }^{ 19 }$$
  • 4.2$$\times \quad { 10 }^{ 18 }$$
  • 4.2$$\times \quad { 10 }^{ 19 }$$
The formula of $$ZnO$$ crystal after heating is ________.
  • $$Zn_{1-x}O$$
  • $$Zn_{1+x}O$$
  • $$ZnO$$
  • All of the above
If the radius of metal atom is 1.00 angstrom and  its crystal structure is simple cubic, then what is the volume of one unit cell?
  • $$8\times 10^{-24}m^3$$
  • $$4\times 10^{-30}cm^3$$
  • $$8\times 10^{-30}m^3$$
  • $$2\times 10^{-23}cm^3$$
The number of lattice points at the centre of the primitive unit cell is
  • 1
  • 2
  • 3
  • 0
A metallic element crystallises in face centred cubic structure. If the radius of metal ion is $$0.92 \mathring (A)$$ the edge length of the unit cell of the crystal is
  • $$0.8464 \mathring {A}$$
  • $$1.252 \mathring {A}$$
  • $$5.187 \mathring {A}$$
  • $$2.6 \mathring {A}$$
All of the following  share the same crystal structure except :
  • $$LiCl$$
  • $$NaCl$$
  • $$RbCl$$
  • $$CsCl$$
The atomic radius of strontium $$(Sr)$$ is $$215\ pm$$ and it crystalllises in cubic closed packed structure. The edge length of cube is :-
  • $$430\ pm$$
  • $$608.2\ pm$$
  • $$496.5\ pm$$
  • $$None\ of\ these$$
The number of $$Na^{+}ions$$ filling all octahedral voids in $$NaCl$$ structure are 
  • $$6$$
  • $$12$$
  • $$13$$
  • $$14$$
Which of the following is the component of $$CsI_3$$ lattice?
  • $$Cs^+, I^-$$ & $$I_2$$ molecule
  • Covalent bond
  • $$Cs^+$$ & $$I_3^-$$ ions
  • $$Cs^+$$ & $$I_2$$
What is a Unit cell?
  •  $$\text{a compound}$$
  •  $$\text{a molecules with some charge}$$
  •  $$\text{smallest group of atoms}$$
  •  $$\text{none of the above}$$
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