-
question_answer1)
Which of the following does not represent radius of the atom correctly? |
(i) Simple cubic cell : Radius of the atom \[=\frac{a}{2}\] |
(ii) Face centred cubic cell : Radius\[=\frac{a}{3\sqrt{3}}\] |
(iii) Body centred cubic cell : Radius \[=\frac{\sqrt{3}}{4}a\] |
A)
(i) done
clear
B)
(iii) done
clear
C)
(ii) done
clear
D)
(i) and (ii) done
clear
View Solution play_arrow
-
question_answer2)
Solid X is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it?
A)
Ionic solid done
clear
B)
Covalent solid done
clear
C)
Metallic solid done
clear
D)
Molecular solid done
clear
View Solution play_arrow
-
question_answer3)
A compound is formed by two elements Y and Z. The element Z forms ccp and atoms Y occupy 1/3rd of tetrahedral voids. The formula of the compound is
A)
\[{{Y}_{2}}{{Z}_{3}}\] done
clear
B)
YZ done
clear
C)
\[Y{{Z}_{3}}\] done
clear
D)
\[{{Y}_{2}}Z\] done
clear
View Solution play_arrow
-
question_answer4)
Ionic solids conduct electricity in molten state but not in solid state because
A)
in molten state free ions are furnished which are not free to move in solid state done
clear
B)
in solid state ionic solids are hard and brittle and become soft in molten state done
clear
C)
all solids conduct electricity in molten state done
clear
D)
in solid state ions are converted to atoms which are insulators. done
clear
View Solution play_arrow
-
question_answer5)
Monoclinic sulphur is an example of monoclinic crystal system. What are the characteristics of the crystal system?
A)
\[a\ne b\ne c,\,\,\alpha =\beta =\gamma =90{}^\circ \] done
clear
B)
\[a\ne b\ne c,\,\,\alpha \ne \beta \ne \gamma \ne 90{}^\circ \] done
clear
C)
\[a=b\ne c,\,\,\alpha =\beta =\gamma =90{}^\circ \] done
clear
D)
\[a\ne b\ne c,\,\,\alpha =\gamma =90{}^\circ ,\,\,\beta \ne 90{}^\circ \] done
clear
View Solution play_arrow
-
question_answer6)
Match the column I with column II and mark the appropriate choice.
| Column - I (Radius ratio) | | Column - II (Coordination number) |
[A] | 0.155 - 0.225 | (i) | 4 |
[B] | 0.225 - 0.414 | (ii) | 8 |
[C] | 0.414 - 0.732 | (iii) | 3 |
[D] | 0.732 - 1.0 | (iv) | 6 |
A)
[A]\[\to \] (i), [B]\[\to \] (ii), [C]\[\to \] (iv), [D]\[\to \] (iii) done
clear
B)
[A]\[\to \] (ii), [B]\[\to \] (iv), [C]\[\to \] (i), [D]\[\to \] (iii) done
clear
C)
[A]\[\to \] (iv), [B]\[\to \] (iii), [C]\[\to \] (i), [D]\[\to \] (ii) done
clear
D)
[A]\[\to \] (iii), [B]\[\to \] (i), [C]\[\to \] (iv), [D]\[\to \] (ii) done
clear
View Solution play_arrow
-
question_answer7)
In face centred cubic unit cell, edge length is
A)
\[\frac{4}{\sqrt{3}}r\] done
clear
B)
\[\frac{4}{\sqrt{2}}r\] done
clear
C)
2r done
clear
D)
\[\frac{\sqrt{3}}{2}r\] done
clear
View Solution play_arrow
-
question_answer8)
How many lithium atoms are present in a unit cell with edge length \[3.5\overset{{}^\circ }{\mathop{A}}\,\] and density \[0.53\text{ }g\text{ }c{{m}^{-3}}\]? (Atomic mass of Li = 6.94)
A)
2 done
clear
B)
1 done
clear
C)
4 done
clear
D)
6 done
clear
View Solution play_arrow
-
question_answer9)
Silver halides generally show
A)
Schottky defect done
clear
B)
Frenkel defect done
clear
C)
both Frenkel and Schottky defects done
clear
D)
cation excess defect. done
clear
View Solution play_arrow
-
question_answer10)
Which of the following statements is not correct regarding covalent crystals diamond and graphite?
A)
In diamond, each carbon atom is covalently bonded to four other carbon atoms. done
clear
B)
In graphite, each carbon atom is covalently bonded to three other carbon atoms in the same plane. done
clear
C)
The \[C-C\] bond length in graphite is intermediate between single and double bond. done
clear
D)
Diamond is a layered structure, the two layers joined by van der Waals' forces. done
clear
View Solution play_arrow
-
question_answer11)
Which of the following structures is not correctly matched?
A)
NaCl type - \[C{{l}^{-}}\] ions in ccp structure. \[N{{a}^{+}}\] ions in half octahedral holes. done
clear
B)
ZnS type - \[{{S}^{2-}}\] ions in ccp structure. \[Z{{n}^{2+}}\]ions in alternate tetrahedral voids. done
clear
C)
\[Ca{{F}_{2}}\] type - \[C{{a}^{2+}}\] ions in ccp structure. \[{{F}^{-}}\] ions in all tetrahedral voids. done
clear
D)
\[N{{a}_{2}}O\] type - \[{{O}^{2-}}\] ions in ccp structure. \[N{{a}^{+}}\] ions in all tetrahedral holes. done
clear
View Solution play_arrow
-
question_answer12)
Which of the following statements is not true about the voids?
A)
Octahedral void is formed at the centre of six spheres which lie at the apices of a regular octahedron. done
clear
B)
There is one octahedral site for each sphere. done
clear
C)
There are two tetrahedral sites for each sphere. done
clear
D)
Octahedral voids are formed when the triangular voids in second layer exactly overlap with similar voids in the first layer. done
clear
View Solution play_arrow
-
question_answer13)
Which among the following will show anisotropy?
A)
Glass done
clear
B)
NaBr done
clear
C)
Plastic done
clear
D)
Rubber done
clear
View Solution play_arrow
-
question_answer14)
In the following figure the blank X in known as __________ and why? |
|
A)
Electron trap, because an electron is present done
clear
B)
Metal deficient centre, since negative charge is present here. done
clear
C)
F-centre, since it imparts colour to the crystal. done
clear
D)
P-centre, since it is responsible for positive charge on the crystal. done
clear
View Solution play_arrow
-
question_answer15)
What type of crystal defect is shown in the figure given below? |
|
A)
Frenkel defect done
clear
B)
Schottky defect done
clear
C)
Interstitial defect done
clear
D)
Cation excess defect done
clear
View Solution play_arrow
-
question_answer16)
Study the figure of a solid given below depicting the arrangement of particles. Which is the most appropriate term used for the figure? |
|
A)
Isotropy done
clear
B)
Anisotropy done
clear
C)
Irregular shape done
clear
D)
Amorphous nature done
clear
View Solution play_arrow
-
question_answer17)
Examples of few solids are given below. Find out the example which is not correctly matched.
A)
Ionic solids - NaCl, ZnS done
clear
B)
Covalent solids - \[{{H}_{2}}{{I}_{2}}\] done
clear
C)
Molecular solids - \[{{H}_{2}}{{O}_{(s)}}\], Urea done
clear
D)
Metallic solids - Cu, Sn done
clear
View Solution play_arrow
-
question_answer18)
Complete the following table : |
|
A)
B)
C)
D)
View Solution play_arrow
-
question_answer19)
The unit cell of aluminium is a cube with an edge length of 405 pm. The density of aluminium is \[2.70\text{ }g\text{ }c{{m}^{-\,3}}\]. What is the structure of unit cell of aluminium?
A)
Body-centred cubic cell done
clear
B)
Face-centred cubic cell done
clear
C)
End-centred cubic cell done
clear
D)
Simple cubic cell done
clear
View Solution play_arrow
-
question_answer20)
If three elements X, Y and Z crystallise in a ccp lattice with X atoms at the corners, Y atoms at the cube centre and Z atoms at the edges, the formula of the compound will be
A)
XYZ done
clear
B)
\[XY{{Z}_{2}}\] done
clear
C)
\[XY{{Z}_{3}}\] done
clear
D)
\[{{X}_{2}}{{Y}_{2}}Z\] done
clear
View Solution play_arrow
-
question_answer21)
NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying
A)
high temperature done
clear
B)
high pressure done
clear
C)
high temperature and high pressure done
clear
D)
low temperature and low pressure. done
clear
View Solution play_arrow
-
question_answer22)
The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass \[50\text{ }g\text{ }mo{{l}^{-1}}\]will be
A)
\[10\text{ }g\text{ }c{{m}^{-\,3}}\] done
clear
B)
\[14.2\text{ }g\text{ }c{{m}^{-\,3}}\] done
clear
C)
\[6.15\text{ }g\text{ }c{{m}^{-\,3}}\] done
clear
D)
\[9.32\text{ }g\text{ }c{{m}^{-\,3}}\] done
clear
View Solution play_arrow
-
question_answer23)
In the given crystal structure what should be the cation X which replaces \[N{{a}^{+}}\]to create to cation vacancy? |
|
A)
\[S{{r}^{2+}}\] done
clear
B)
\[{{K}^{+}}\] done
clear
C)
\[L{{i}^{+}}\] done
clear
D)
\[B{{r}^{-}}\] done
clear
View Solution play_arrow
-
question_answer24)
A crystalline structure has radius ratio\[\left( {{r}_{{{c}^{+}}}}/{{r}_{{{a}^{-}}}} \right)\] in the range of 0.225 - 0.414, The coordination number and arrangement of anions around the cations is
A)
3, plane triangular done
clear
B)
6, octahedral done
clear
C)
4, tetrahedral done
clear
D)
8, cubic. done
clear
View Solution play_arrow
-
question_answer25)
Which of the following primitive cells show the given parameters? \[a\ne b\ne c,\alpha =\beta =\gamma =90{}^\circ \]
A)
Cubic done
clear
B)
Tetragonal done
clear
C)
Orthorhombic done
clear
D)
Hexagonal done
clear
View Solution play_arrow
-
question_answer26)
If the distance between \[N{{a}^{+}}\] and \[C{{l}^{-}}\]in NaCl crystal is 265 pm, the edge length of the unit cell will be
A)
265 pm done
clear
B)
795 pm done
clear
C)
132.5 pm done
clear
D)
530 pm done
clear
View Solution play_arrow
-
question_answer27)
Fill in the blanks by choosing the correct option. Metals often occur in x condition. Individual crystals are randomly oriented so a metallic sample may appear to be y even though a single crystal is z.
A)
B)
C)
D)
View Solution play_arrow
-
question_answer28)
In \[Ca{{F}_{2}}\] type (fluorite structure) \[C{{a}^{2+}}\]ions form [A] structure and \[{{F}^{-}}\]ions are present in all [B] voids. The coordination number of \[C{{a}^{2+}}\] is [C] and \[{{F}^{-}}\] is [D] [A], [B], [C] and [D] respectively are
A)
B)
C)
D)
View Solution play_arrow
-
question_answer29)
Which is the defect represented by the given figure? |
|
A)
Schottky defect done
clear
B)
Frenkel defect done
clear
C)
Vacancy defect done
clear
D)
Interstitial defect done
clear
View Solution play_arrow
-
question_answer30)
Coordination numbers of \[C{{s}^{+}}\]and \[C{{l}^{-}}\] in CsCl crystal are
A)
8, 8 done
clear
B)
4, 4 done
clear
C)
6, 6 done
clear
D)
8, 4 done
clear
View Solution play_arrow
-
question_answer31)
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 centred cubic structure | (ii) | 74% |
[C] | Body centred cubic structure | (iii) | 52% |
A)
[A] \[\to \] (iii), [B] \[\to \] (ii), [C] \[\to \] (i) done
clear
B)
[A] \[\to \] (i), [B] \[\to \] (ii), [C] \[\to \] (iii) done
clear
C)
[A] \[\to \] (ii), [B] \[\to \] (i), [C] \[\to \] (iii) done
clear
D)
[A] \[\to \] (iii), [B] \[\to \] (i), [C] \[\to \] (ii) done
clear
View Solution play_arrow
-
question_answer32)
Which of the following statements is not true?
A)
Silicon carbide is a covalent crystal. done
clear
B)
Molecular crystals are soft in nature. done
clear
C)
In calcium fluoride structure, coordination number of \[C{{a}^{2+}}\] is 4. done
clear
D)
Increase in radius ratio results in increase in coordination number. done
clear
View Solution play_arrow
-
question_answer33)
Match the column I having type of lattice point and its contribution to one unit cell in column II and mark the appropriate choice.
| Column - I (Lattice point) | | Column - II (Contribution to one unit cell) |
[A] | Corner | (i) | 1 |
[B] | Edge | (ii) | 1/8 |
[C] | Face centre | (iii) | 1/4 |
[D] | Body centre | (iv) | 1/2 |
A)
[A]\[\to \] (ii), [B]\[\to \] (i), [C]\[\to \] (iii), [D]\[\to \] (iv) done
clear
B)
[A]\[\to \] (ii), [B]\[\to \] (iii), [C]\[\to \] (iv), [D]\[\to \] (i) done
clear
C)
[A]\[\to \] (i), [B]\[\to \] (ii), [C]\[\to \] (iv), [D]\[\to \] (iii) done
clear
D)
[A]\[\to \] (iii), [B]\[\to \] (iv), [C]\[\to \] (i), [D]\[\to \] (ii) done
clear
View Solution play_arrow
-
question_answer34)
In the table given below, dimensions and angles of various crystals are given. Complete the table by filling the blanks. |
|
| Type of crystal | Dimensions | Angles |
1. | Cubic | A=b=c | \[\alpha =\beta =\gamma \,\,=\,\,\underline{p}\] |
2. | Tetragonal | q | \[\alpha =\beta =\gamma =90{}^\circ \] |
3. | Orthorhombic | \[a\ne b\ne c\] | r |
4. | Hexagonal | s | \[\alpha =\beta ={{90}^{{}^\circ }},\gamma =\underset{\scriptscriptstyle-}{t}\] |
A)
B)
C)
D)
View Solution play_arrow
-
question_answer35)
In Zinc blende structure,
A)
zinc ions occupy half of the tetrahedral sites. done
clear
B)
each \[Z{{n}^{2+}}\] ion is surrounded by six sulphide ions done
clear
C)
each \[{{S}^{2-}}\] ion is surrounded by six \[Z{{n}^{2+}}\] ions done
clear
D)
all of these. done
clear
View Solution play_arrow
-
question_answer36)
Match the column A with column B and select the correct option.
| Column A | | Column B |
A. | Ionic solid | I. | NaCl |
B. | Metallic solid | II. | Fe |
C. | Covalent solid | III. | C(graphite) |
D. | Molecular solid | IV. | Dry ice |
A)
A-II, B-I, C-IV, D-III done
clear
B)
A-I, B-II, C-III, D-IV done
clear
C)
A-III, B-II, C-I, D-IV done
clear
D)
A-II, B-IV, C-I, D-III done
clear
View Solution play_arrow
-
question_answer37)
Which of the following statements is not correct about molecular crystals?
A)
They are generally soft and easily compressible. done
clear
B)
They are good conductors of electricity as the electrons are delocalised in bonds. done
clear
C)
They have low melting and boiling points. done
clear
D)
They consist of polar or non-polar molecules. done
clear
View Solution play_arrow
-
question_answer38)
Which of the following defects is represented in the given figure? |
|
A)
Impurity defect done
clear
B)
Frenkel defect done
clear
C)
Schottky defect done
clear
D)
Metal excess defect done
clear
View Solution play_arrow
-
question_answer39)
A metal crystallises into a lattice containing a sequence of layers as ABABAB .............What percentage of voids are left in the lattice?
A)
72% done
clear
B)
48% done
clear
C)
26% done
clear
D)
32% done
clear
View Solution play_arrow
-
question_answer40)
If the radius of an octahedral void is r and radius of atoms in close packing is R, the relation between r and R is
A)
r = 0.414K done
clear
B)
R = 0.414r done
clear
C)
r = 2R done
clear
D)
\[r=\sqrt{2}R\] done
clear
View Solution play_arrow
-
question_answer41)
A cubic solid is made up of two elements P and Q. Atoms of P are present at the corners of the cube and atoms of Q are present at body centre. What is the formula of the compound and what are coordination numbers of P and Q?
A)
\[P{{Q}_{2}}\,,\,\,6\,\,:\,\,6\] done
clear
B)
PQ, 6 : 6 done
clear
C)
\[{{P}_{2}}Q,\,\,6\,\,:\,\,8~\] done
clear
D)
PQ, 8 : 8 done
clear
View Solution play_arrow
-
question_answer42)
Total volume of atoms present in a fcc unit cell of a metal with radius r is
A)
\[\frac{12}{3}\pi {{r}^{3}}\] done
clear
B)
\[\frac{16}{3}\pi {{r}^{3}}\] done
clear
C)
\[\frac{20}{3}\pi {{r}^{3}}\] done
clear
D)
\[\frac{24}{3}\pi {{r}^{3}}\] done
clear
View Solution play_arrow
-
question_answer43)
Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?
A)
157pm done
clear
B)
181pm done
clear
C)
127pm done
clear
D)
108pm done
clear
View Solution play_arrow
-
question_answer44)
The fraction of the total volume occupied by the atoms present in a simple cube is
A)
\[\frac{\pi }{4}\] done
clear
B)
\[\frac{\pi }{6}\] done
clear
C)
\[\frac{\pi }{3\sqrt{2}}\] done
clear
D)
\[\frac{\pi }{4\sqrt{2}}\] done
clear
View Solution play_arrow
-
question_answer45)
Volume occupied by single CsCl ion pair in a crystal is \[7.014\times {{10}^{-23\text{ }}}c{{m}^{3}}\]. The smallest Cs - Cs internuclear distance is equal to length of the side of the cube corresponding to volume of one CsCI ion pair. The smallest Cs to Cs internuclear distance is nearly
A)
\[4.4\overset{{}^\circ }{\mathop{A}}\,\] done
clear
B)
\[4.3\overset{{}^\circ }{\mathop{A}}\,\] done
clear
C)
\[4\overset{{}^\circ }{\mathop{A}}\,\] done
clear
D)
\[4.5\overset{{}^\circ }{\mathop{A}}\,\] done
clear
View Solution play_arrow
-
question_answer46)
What type of stoichiometric defect is shown by ZnS?
A)
Schottky defect done
clear
B)
Frenkel defect done
clear
C)
Both Frenkel and Schottky defects done
clear
D)
Non-stoichiometric defect done
clear
View Solution play_arrow
-
question_answer47)
Formula of nickel oxide with metal deficiency defect in its crystal is \[N{{i}_{0.98}}O\]. The crystal contains \[N{{i}^{2+}}\] and \[N{{i}^{3+}}\] ions. The fraction of nickel existing as \[N{{i}^{2+}}\] ions in the crystal is
A)
0.94 done
clear
B)
0.04 done
clear
C)
0.50 done
clear
D)
0.3 done
clear
View Solution play_arrow
-
question_answer48)
The edge length of sodium chloride unit cell is 564 pm. If the size of \[C{{l}^{-}}\] ion is 181 pm. The size of \[N{{a}^{+}}\] ion will be
A)
101 pm done
clear
B)
181 pm done
clear
C)
410pm done
clear
D)
202pm done
clear
View Solution play_arrow
-
question_answer49)
The unit cell shown in the figure belongs to |
|
A)
NaCl type done
clear
B)
ZnS type done
clear
C)
CsCl type done
clear
D)
\[Ca{{F}_{2}}\]type. done
clear
View Solution play_arrow
-
question_answer50)
The edge length of unit cells in terms of radius of spheres for fcc is X , for bcc Y and for sec is Z.
A)
\[X=2\sqrt{2}r,\,Y=\frac{4r}{\sqrt{3}},\,Z=2r\] done
clear
B)
\[X=\frac{4r}{\sqrt{3}},\,Y=2\sqrt{2},\,Z=2r\] done
clear
C)
\[X=2r,\,Y=2\sqrt{2}r,\,Z=\frac{4r}{\sqrt{3}}\] done
clear
D)
\[X=2r,\,Y=\frac{4r}{\sqrt{3}},\,Z=2\sqrt{2}r\] done
clear
View Solution play_arrow
-
question_answer51)
A metal has a /cc lattice. The edge length of the unit cell is 404 pm. The density of the metal is \[2.72\,\,g\,\,c{{m}^{-\,3}}\]. The molar mass of the metal is \[({{N}_{A}}\] Avogadro's constant \[=6.02\times {{10}^{23}}mo{{l}^{-1}})\]
A)
\[27\,\,g\,\,mo{{l}^{-1}}\] done
clear
B)
\[20\text{ }g\text{ }mo{{l}^{-1}}\] done
clear
C)
\[40\text{ }g\text{ }mo{{l}^{-1}}\] done
clear
D)
\[30\text{ }g\text{ }mo{{l}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer52)
Zinc oxide loses oxygen on heating according to the reaction, \[ZnO\xrightarrow{heat}Z{{n}^{2+}}+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\] It becomes yellow on heating because
A)
\[Z{{n}^{2+}}\] ions and electrons move to interstitial sites and F-centres are created done
clear
B)
Oxygen and electrons move out of the crystal and ions become yellow done
clear
C)
\[Z{{n}^{2+}}\] again combine with oxygen to give yellow oxide done
clear
D)
\[Z{{n}^{2+}}\] are replaced by oxygen. done
clear
View Solution play_arrow
-
question_answer53)
In ccp arrangement the pattern of successive layers can be designated as
A)
AB AB AB done
clear
B)
ABC ABC ABC done
clear
C)
AB ABC AB done
clear
D)
ABA ABA ABA done
clear
View Solution play_arrow
-
question_answer54)
Which type of crystals contain more than one Bravais lattice?
A)
Hexagonal done
clear
B)
Triclinic done
clear
C)
Rhombohedral done
clear
D)
Monoclinic done
clear
View Solution play_arrow
-
question_answer55)
For the given structure the site marked as S is a |
|
A)
tetrahedral void done
clear
B)
cubic void done
clear
C)
octahedral void done
clear
D)
none of these. done
clear
View Solution play_arrow
-
question_answer56)
In a Schottky defect,
A)
an ion moves to interstitial position between the lattice points done
clear
B)
electrons are trapped in a lattice site done
clear
C)
some lattice sites are vacant done
clear
D)
some extra cations are present in interstitial spaces. done
clear
View Solution play_arrow
-
question_answer57)
A compound \[{{M}_{p}}{{X}_{q}}\] has cubic close packing (ccp) arrangement of X. Its unit cell structure shown below. The empirical formula of the compound is |
|
A)
MX done
clear
B)
\[M{{X}_{2}}\] done
clear
C)
\[{{M}_{2}}X\] done
clear
D)
\[{{M}_{5}}{{X}_{14}}\] done
clear
View Solution play_arrow
-
question_answer58)
The anionic sites occupied by unpaired electrons are called F-centres or colour centres. They impart (X) colour to the crystals of NaCl. Excess of lithium makes Lid crystals (Y) and excess of potassium makes KCl crystals (Z). (X), (Y) and (Z) are
A)
yellow, green and pink respectively done
clear
B)
pink, yellow and violet (or lilac) respectively done
clear
C)
yellow, pink and violet (or lilac) respectively done
clear
D)
red, yellow and pink respectively. done
clear
View Solution play_arrow
-
question_answer59)
Which of the following statements in not correct about hexagonal close packing?
A)
In hcp, atoms occupy 74% the available space. done
clear
B)
It is AB AB type packing in which third layer is aligned with the first layer. done
clear
C)
Be, Cd, Li, Ca, Cr etc. are found to have hcp structure. done
clear
D)
The coordination number is 6. done
clear
View Solution play_arrow
-
question_answer60)
How many chloride ions are surrounding sodium ion in sodium chloride crystal?
A)
4 done
clear
B)
8 done
clear
C)
6 done
clear
D)
12 done
clear
View Solution play_arrow