$$\text{smallest group of atoms}$$

$$\text{a molecules with some charge}$$

MCQ Questions for Class 12 Engineering Chemistry The Solid State Quiz 3

Which of the following parameters are correct for triclinic lattice?

0%
$\alpha = \beta = \gamma = 9 ^ { \circ }$ and $a = b = c$
0%
$\alpha \neq \beta \neq \gamma \neq 90 ^ { \circ } \text { and } a \neq b \neq c$
0%
$\alpha = \gamma = 90 ^ { \circ } , \beta \neq 90 ^ { \circ } \text { and } a \neq b \neq c$
0%
$\alpha = \beta = \gamma = 90 ^ { \circ } \text { and } a \neq b \neq c$

A solid ABC has A, B and C arranged as below. The formula of solid is:

0%
$ABC$
0%
${ AB }_{ 2 }{ C }_{ 2 }$
0%
${ A }_{ 2 }B{ C }$
0%
${ A }B_{ 8 }{ C }_{ 2 }$

Select the correct statement (s) :

0%
The ionic crystal of $AgBr$ may have Schottky defect.
0%
The unit cell having crystal parameters, $a=b\neq c,\alpha =\beta ={ 90 }^{ \circ },\gamma ={ 120 }^{ \circ }$ is hexagonal.
0%
In ionic compounds having Frankel defect the ratio ${ r }^{ + }/{ r }^{ - }$ is high.
0%
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

0%
$CuAg_3Au$
0%
$Cu_3Au_3Ag$
0%
$CuAgAu$
0%
$Cu_2AuAg$

Edge length is 200

$\mathrm { pm }$ in body-centred unit cell what will be the radius of atom in pm?

0%
139
0%
150
0%
86.6
0%
93.4

The limiting radius ratio of the complex

${ \left[ Ni{ \left( CN \right) }_{ 4 } \right] }^{ 2- }$ is

0%
0.225-0.414
0%
0.414-0.732
0%
0.155-0.225
0%
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:

0%
$\sqrt{2} a$
0%
$\dfrac{a}{\sqrt{2}}$
0%
$2 a$
0%
$2 \sqrt{2}{a}$

Which of the following is the only incorrect statement regarding amorphous solids?

0%
On heating, they may become crystalline at some temperature
0%
They may become crystalline on keeping for long time
0%
Amorphous solids can be molded by heating
0%
They are anisotropic in nature

CCP is also called as :

0%
FCC
0%
BCC
0%
Primitive
0%
HCP

Which of the following characteristic features match(es) with the crystal systems: hexagonal and monoclinic?

0%
Both have the cell parameters; $a=b=c$ and $\alpha =\beta =\gamma$
0%
Both belong to different crystal systems
0%
Both have only two crystallographic angles of $90^o$
0%
Both belong to same crystal system

Explanation

Hexagonal and monoclinic unit cells are two crystal systems.

They have only two crystallography angles of

$90^0.$

Hexagonal-

$a=b\not=c$ and

$\alpha=\beta=90^0$ and

$\gamma=120^0$

Monoclinic-

$a\not=b\not=c$ and

$\alpha=\gamma=90^0$ and

$\beta\not=90^0$

Option B and C are correct.

$AgBr$ crystal, the ion size lies in the order

$Ag^{+} < < Br^{-}$ . The

$AgBr$ crystal should have:

0%
Defectless (perfect) crystal
0%
Schottky defect only
0%
Frenkel defect only
0%
Both Schottky and Frenkel defects

Explanation

$AgBr$ exhibits Frenkel defect due to large difference in the size of

$Ag^{+}$ and

$Br^{-}$ ions.

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%
$0.155$
0%
$0.255$
0%
$0.414$
0%
$0.732$

The crystal lattice of ice is mostly formed by :

0%
ionic forces
0%
covalent bonds
0%
intramolecular H-bonds
0%
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 :

$Cr = 52.0$ )

0%
$6.80$
0%
$7.60$
0%
$6.60$
0%
$7.23$

The fraction of volume occupied by atoms in a body centered cubic unit cell is:

0%
$0.32$
0%
$0.48$
0%
$0.68$
0%
$0.74$

Choose the correct statement about the given figures.

0%
$(II)$ represents solid state while $(III)$ represent liquid state.
0%
$(II)$ represents solid state while $(III)$ represent solid state.
0%
$(I)$ represents solid state while $(III)$ represent liquid state.
0%
$(I)$ represents solid state while $(III)$ represent solid state.

Complete the given table:

0%
$A$ - Impurity Defect ; $B$ - Stoichiometric Defect ; $C$ - Non-Stoichiometric Defect ; $D$ - Anion Excess Defect
0%
$A$ - Stoichiometric Defect ; $B$ - Non-Stoichiometric Defect ; $C$ - Impurity Defect ; $D$ - Metal Excess Defect
0%
$A$ - Non-Stoichiometric Defect ; $B$ - Stoichiometric Defect ; $C$ - Impurity Defect ; $D$ - Cation Defect
0%
$A$ - Impurity Defect ; $B$ - Stoichiometric Defect ; $C$ - Metal Excess Defect ; $D$ - Non-Stoichiometric Defect

Which is the effect represented by the given figure?

0%
Schottky defect
0%
Frenkel defect
0%
Vacancy defect
0%
Interstitial defect

The fraction of volume occupied by atoms in a face centered cubic unit cell is :

0%
$0.32$
0%
$0.48$
0%
$0.68$
0%
$0.74$

Explanation

$\text { Answer: }-\text { (d) } 0.74 \\$

$\text { Radius of face centered cube }=\dfrac{\sqrt{2} q}{4} \\$

$\text { No. of atoms } / \text { unit }=4$

Paking fraction

$=\dfrac{\dfrac{4}{3} \pi r^{3}}{a^{3}}=\dfrac{\dfrac{4}{3} \pi\left(\dfrac{\sqrt{2} a}{4}\right)^{3}}{a^{3}}=\dfrac{\pi \sqrt{2}}{6}$

$=0.74$

$=74 \%$

Which of the following crystal lattice has the minimum empty space ?

0%
Simple cubic
0%
Body centered cubic
0%
Face centered cubic
0%
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 :

0%
Cubic
0%
Tetragonal
0%
Monoclinic
0%
Rhombohedral

Dopping of

$AgCl$ crystals with

$CdCl_{2}$ results in:

0%
Schottky defect
0%
Frenkel defect
0%
Substitutional cation vacancy
0%
Formation of F-centres

Structure shown here represents :

0%
Schottky defect
0%
Frenkel defect
0%
Both defects
0%
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 :

0%
Rock salt structure
0%
Zinc blende structure
0%
Antifluorite structure
0%
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:

0%
$41.66 \,g/cm^3$
0%
$4.166 \,g/cm^3$
0%
$10.25 \,g/cm^3$
0%
$1.025 \,g/cm^3$

Explanation

Mass of

$12 \times 10^{23}$ atoms

$= 100 \,gm$
Mass of

$6.022 \times 10^{23}$ atom

$= \dfrac{100}{12 \times 10{^23}} \times 6.023 \times 10^{23}$

$= 50.18$

$\therefore \rho = \dfrac{4 \times 50.18 \times 10}{6.023 \times 10^{23} \times (200 \times 10^{-10})^{3}}$

$= 41.66 \,g / cm^{3}$

one or more answers is / are correct.
Select the correct statement(s):

0%
The co-ordination number of each type of ion in a CsCl crystal is twelve
0%
A metal that crystallizes in a bcc structure has a co-ordination number of twelve
0%
A unit cell of an ionic crystal shares some of its ions with other unit cells
0%
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:

0%
Density of hcp will be greater than ccp
0%
Density of hcp will be smaller than ccp
0%
Density of hcp will be equal to ccp
0%
Density of hcp may be equal or greater than ccp depending upon the temperature of the system.

Which one is an amorphous solid?

0%
Diamond
0%
Graphite
0%
Common salt
0%
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

0%
12
0%
16
0%
18
0%
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?

0%
$6.85 \times 10^2$
0%
$5.82 \times 10^{23}$
0%
$4.37 \times 10^5$
0%
$2.12 \times 10^6$

$KF$ 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 :

0%
$537.6 \ pm$
0%
$268.8\ pm$
0%
$107.5\ pm$
0%
$Cannot\ be\ calculated$

Which of the following solids have tetragonal crystal system

0%
$NaCl$
0%
$ZnS$
0%
$TiO_{2}$
0%
$ZnO$

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

0%
$2$
0%
$3$
0%
$4$
0%
$6$

Which of fallowing has different structure than other?

0%
NaCl
0%
LiCl
0%
RbCl
0%
CsCl

How many types of crystalline solids are found?

0%
$2$
0%
$6$
0%
$4$
0%
none of these

Which of the following is correct?

0%
Crystal system $\rightarrow$ Cubic;
Axial distance $\rightarrow$ a=b=c;
Axial angles $\rightarrow$ $\alpha =$ $\beta = y = 90^o$ ;
Examples $\rightarrow$ $Cu,KCl$
0%
Crystal system $\rightarrow$ Monoclinic $\rightarrow$ ; Axial distance $\rightarrow$ a=b=c ;
Axial angles $\rightarrow$ $\alpha =$ $\beta = y = 90^o$ ;
Examples $\rightarrow$ $PbCrO_2, PbCrO_4$
0%
Crystal system $\rightarrow$ Rhomboherdal; Axial distance $\rightarrow$ a = b = c;

Example $\rightarrow$ $CaCO_3$
0%
Crystal system $\rightarrow$ Triclinic; Axial distance $\rightarrow$ a = b = c;

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 :

0%
8.6 pm
0%
201.5 pm
0%
698 pm
0%
578 pm

Edge length of a cubic unit cell is 354 pm,The distance between two atoms diagonally opposite on the face is

0%
500 pm
0%
354 pm
0%
700 pm
0%
627 pm

Edge length of a cube is 400 pm, its body diagonal would be

0%
500 pm
0%
600 pm
0%
566 pm
0%
693 pm

Which of the following has highest lattice energy?

0%
NaCl
0%
$MgCl_2$
0%
KCl
0%
$BaCl_2$

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/

${ cm }^{ 3 }$ ?

0%
3.6 $\times \quad { 10 }^{ 18 }$
0%
3.6 $\times \quad { 10 }^{ 19 }$
0%
4.2 $\times \quad { 10 }^{ 18 }$
0%
4.2 $\times \quad { 10 }^{ 19 }$

The formula of

$ZnO$ crystal after heating is ________.

0%
$Zn_{1-x}O$
0%
$Zn_{1+x}O$
0%
$ZnO$
0%
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?

0%
$8\times 10^{-24}m^3$
0%
$4\times 10^{-30}cm^3$
0%
$8\times 10^{-30}m^3$
0%
$2\times 10^{-23}cm^3$

The number of lattice points at the centre of the primitive unit cell is

0%
1
0%
2
0%
3
0%
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%
$0.8464 \mathring {A}$
0%
$1.252 \mathring {A}$
0%
$5.187 \mathring {A}$
0%
$2.6 \mathring {A}$

All of the following share the same crystal structure except :

0%
$LiCl$
0%
$NaCl$
0%
$RbCl$
0%
$CsCl$

The atomic radius of strontium

$(Sr)$ is

$215\ pm$ and it crystalllises in cubic closed packed structure. The edge length of cube is :-

0%
$430\ pm$
0%
$608.2\ pm$
0%
$496.5\ pm$
0%
$None\ of\ these$

The number of

$Na^{+}ions$ filling all octahedral voids in

$NaCl$ structure are

0%
$6$
0%
$12$
0%
$13$
0%
$14$

Which of the following is the component of

$CsI_3$ lattice?

0%
$Cs^+, I^-$ & $I_2$ molecule
0%
Covalent bond
0%
$Cs^+$ & $I_3^-$ ions
0%
$Cs^+$ & $I_2$

What is a Unit cell?

0%
$\text{a compound}$
0%
$\text{a molecules with some charge}$
0%
$\text{smallest group of atoms}$
0%
$\text{none of the above}$

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

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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