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Chemistry MCQ

Solid State · Maharashtra Board STD 12 (MSBSHSE - Semi English Medium). 107 questions.

Questions · Page 2 of 3

MCQ

MCQ 511 Mark
The volume of atoms present in body centred cubic unit cell of a metal of atomic radius r is,
  • A
    $\frac{16}{3} \pi r^3$
  • ✓
    $\frac{8}{3} \pi r^3$
  • C
    $\frac{12}{3} \pi r^3$
  • D
    $\frac{24}{3} \pi r^3$
Answer
Correct option: B.
$\frac{8}{3} \pi r^3$
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MCQ 531 Mark
An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face and ‘B’ ions occupying comers of the cube. The formula of compound is
  • A
    $AB _4$
  • ✓
    $A _3 B$
  • C
    $AB$
  • D
    $AB _3$
Answer
Correct option: B.
$A _3 B$
B
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MCQ 541 Mark
Schottky defects are observed in which solid among the following ?
  • A
    Brass
  • ✓
    Cesium chloride
  • C
    Zinc sulphide
  • D
    Stainless steel
Answer
Correct option: B.
Cesium chloride
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MCQ 551 Mark
The type of defect in NaCl crystal will be
  • A
    point defect
  • B
    interstitial defect
  • ✓
    vacancy defect
  • D
    impurity defect
Answer
Correct option: C.
vacancy defect
C
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MCQ 561 Mark
An ionic solid crystallises in bcc structure. If the ionic radii of cation and anion are 0.84 Å and 1.07 Å, the length of the body diagonal is
  • A
    1.91 Å
  • B
    2.75 Å
  • ✓
    3.82 Å
  • D
    2.32 Å
Answer
Correct option: C.
3.82 Å
C
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MCQ 571 Mark
A defect present in AgCl is
  • ✓
    Frenkel defect
  • B
    Schottky defect
  • C
    point defect
  • D
    interstitial impurity defect
Answer
Correct option: A.
Frenkel defect
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MCQ 581 Mark
The ratio of close packed atoms to octahedral holes in cubic packing is
  • ✓
    1 : 1
  • B
    1 : 2
  • C
    2 : 1
  • D
    1 : 3
Answer
Correct option: A.
1 : 1
A
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MCQ 591 Mark
The major binding force in diamond is
  • ✓
    Covalent bond
  • B
    Ionic bond
  • C
    Metallic bond
  • D
    Coordinate covalent bond
Answer
Correct option: A.
Covalent bond
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MCQ 601 Mark
The correct sequence of the atomic layers in cubic close packing is
  • A
    ABABA
  • B
    ABACABAC
  • ✓
    ABCABC
  • D
    AABBAABB
Answer
Correct option: C.
ABCABC
C
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MCQ 611 Mark
The ratio of packing efficiency in see, bcc and fee crystalline structures is
  • A
    1 : 1.2 : 1.3
  • B
    1 : 1.12 : 1.23
  • ✓
    1 : 1.3 : 1.4
  • D
    1 : 1.25 : 1.38
Answer
Correct option: C.
1 : 1.3 : 1.4
C
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MCQ 621 Mark
If r is the radius of an atom and a is an edge length of fcc unit cell, then
  • A
    $r=\frac{\sqrt{3}}{4} a$
  • ✓
    $r=\frac{a}{2 \sqrt{2}}$
  • C
    $r=\frac{a}{2}$
  • D
    $r=2 \sqrt{2} a$
Answer
Correct option: B.
$r=\frac{a}{2 \sqrt{2}}$
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MCQ 631 Mark
 The packing fraction for a body centred cubic structure is
  • A
    0.42
  • B
    0.53
  • ✓
    0.68
  • D
    0.82
Answer
Correct option: C.
0.68
C
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MCQ 651 Mark
Face centred cubic crystal is
  • A
    Cubic lattice of Bravais system
  • B
    Bravais lattice of HCP
  • ✓
    Bravais lattice of cubic system
  • D
    Cubic lattice with 5 atoms
Answer
Correct option: C.
Bravais lattice of cubic system
C
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MCQ 691 Mark
Graphite is a
  • A
    metallic crystal
  • ✓
    covalent crystal
  • C
    ionic crystal
  • D
    molecular crystal
Answer
Correct option: B.
covalent crystal
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MCQ 701 Mark
A single substance that exists in two or more forms is called
  • ✓
    polymorphous
  • B
    amorphous
  • C
    isomorphous
  • D
    monomorphous
Answer
Correct option: A.
polymorphous
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MCQ 711 Mark
In solids the constituent particles may be
  • A
    atoms
  • B
    ions
  • C
    molecules
  • ✓
    any one of the above three
Answer
Correct option: D.
any one of the above three
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MCQ 721 Mark
A solid which has definite heat of fusion is
  • A
    plastic
  • ✓
    $CaCl _2$
  • C
    glass
  • D
    soda lime glass
Answer
Correct option: B.
$CaCl _2$
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MCQ 731 Mark
A substance which on cutting will give irregular cleavage is
  • ✓
    glass
  • B
    KBr
  • C
    ZnS
  • D
    NaCl
Answer
Correct option: A.
glass
A
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MCQ 741 Mark
Pb has fcc structure with edge length of unit cell 495 pm. Radius of Pb atom is
  • A
    205 pm
  • B
    185 pm
  • C
    260 pm
  • ✓
    175 pm
Answer
Correct option: D.
175 pm
175 pm
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MCQ 751 Mark
A compound forms hcp structure. Number of octahedral and tetrahedral voids in $0.5 mole$ of substance is respectively
  • ✓
    $3.011 \times 10^{23}, 6.022 \times 10^{23}$
  • B
    $6.022 \times 10^{23}, 3.011 \times 10^{23}$
  • C
    $4.011 \times 10^{23}, 2.011 \times 10^{23}$
  • D
    $6.011 \times 10^{23}, 12.022 \times 10^{23}$
Answer
Correct option: A.
$3.011 \times 10^{23}, 6.022 \times 10^{23}$
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MCQ 761 Mark
Which of the following is not correct ?
  • A
    Four spheres are involved in the formation of tetrahedral void.
  • B
    The centres of spheres in octahedral voids are at the a pices of a regular tetrahedron.
  • ✓
    If the number of atoms is N the number of octahedral voids is 2N.
  • D
    If the number of atoms is N/2, the number of tetrahedral voids is N.
Answer
Correct option: C.
If the number of atoms is N the number of octahedral voids is 2N.
If the number of atoms is N the number of octahedral voids is 2N.
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MCQ 781 Mark
In crystal lattice formed by bcc unit cell the void volume is
  • A
    0.68
  • B
    0.74
  • ✓
    0.32
  • D
    0.26
Answer
Correct option: C.
0.32
0.32
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MCQ 791 Mark
In Frenkel defect
  • A
    electrical neutrality of the substance is changed.
  • B
    density of the substance is changed.
  • C
    both cation and anion are missing
  • ✓
    overall electrical neutrality is preserved
Answer
Correct option: D.
overall electrical neutrality is preserved
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MCQ 801 Mark
Which of the following is n-type semiconductor?
  • A
    Pure Si
  • ✓
    Si doped with As
  • C
    Si doped with Ga
  • D
    Ge doped with In
Answer
Correct option: B.
Si doped with As
Si doped with As
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MCQ 811 Mark
Molecular solids are
  • A
    crystalline solids
  • ✓
    amorphous solids
  • C
    ionic solids
  • D
    metallic solids
Answer
Correct option: B.
amorphous solids
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MCQ 821 Mark
Find the radius of metal atom in simple cubic unit cell having edge length $334.7 pm$ ?
  • ✓
    $167.35 pm$
  • B
    $334.70 pm$
  • C
    $144.93 pm$
  • D
    $118.32 pm$
Answer
Correct option: A.
$167.35 pm$
(a) : For simple cubic cell, edge length, $a=2 r$
334.7 $pm =2 r$
$
\Rightarrow r=\frac{334.7 pm }{2}=167.35 pm
$
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MCQ 831 Mark
Which from following metal has ccp crystal structure?
  • ✓
    $Cu$
  • B
    $Zn$
  • C
    $Mg$
  • D
    $Po _0$
Answer
Correct option: A.
$Cu$
(a) : Copper, siher and gold have acp crystal structure.
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MCQ 841 Mark
What is the number of unit cells when one mole atom of a metal, that forms simple cubic structure?
  • ✓
    $6.022 \times 10^{23}$
  • B
    $1.204 \times 10^{24}$
  • C
    $9.033 \times 10^{23}$
  • D
    $3.011 \times 10^{23}$
Answer
Correct option: A.
$6.022 \times 10^{23}$
(a) : A simple cubic crystal unit cell has 8 atoms at its corner. The total number of atoms in the unit cell is $8 \times \frac{1}{8}=1$ atom. For one mole of atom, $N_A$ number of unit cells are present i.c., $6.022 \times 10^{23}$.
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MCQ 851 Mark
What is the packing efficiency of silver metal in its unit cell?
  • A
    $52.4 \%$
  • B
    $68.0 \%$
  • C
    $32.0 \%$
  • ✓
    $74.0 \%$
Answer
Correct option: D.
$74.0 \%$
(d) : Silver crystallises in foc crystal structure and packing efficiency of foc (or ccp) is $74 \%$.
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MCQ 861 Mark
A compound made of elements $A$ and $B$ form $f c c$ structure. Atoms of $A$ are at the corners and atoms of $B$ are present at the centres of faces of cube. What is the formula of the compound?
  • A
    $A B$
  • B
    $A B_2$
  • ✓
    $A B_3$
  • D
    $A_2 B$
Answer
Correct option: C.
$A B_3$
(c) : A face-centred cubic unit cell contains atoms at the comer and at the centre of all faces of the cube. There are total 8 corners and each contributes one-eighth to the unit cell. As, $A$ atoms are present at corners.
Total $A$ atoms in a unit cell $=8 \times \frac{1}{8}=1$
There are 6 face-centres and each contributes one-half to the unit cell. As, $B$ atoms are present at face-centres,
Total $B$ atoms in a unit cell $=6 \times \frac{1}{2}=3$
Thus, the formula of the compound is $A B_3$.
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MCQ 871 Mark
Calculate the edge length of $b c c$ unit cell if radius of metal atom is $227 pm$.
  • A
    $4.54 \times 10^{-8} cm$
  • ✓
    $5.24 \times 10^{-8} cm$
  • C
    $6.42 \times 10^{-8} cm$
  • D
    $1.135 \times 10^{-8} cm$
Answer
Correct option: B.
$5.24 \times 10^{-8} cm$
(b) $: r=227 pm$
For bec crysial, $\frac{\sqrt{3}}{4} a=r$ $a=\frac{4 r}{\sqrt{3}}=\frac{4 \times 227}{\sqrt{3}}=5.24 \times 10^{-8} cm$
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MCQ 881 Mark
Which from following combinations is an example for construction of $n$-type semiconductor?
  • A
    Si doped with B
  • ✓
    Si doped with P
  • C
    Si doped with Ga
  • D
    Si doped with In
Answer
Correct option: B.
Si doped with P
(b) : Group 14 element (Si) is doped with group 15 element $( P$ ) in n-type semiconductors.
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MCQ 891 Mark
Which among the following elements does not exhibit ferromagnetic properties?
  • ✓
    $Cr$
  • B
    $Fe$
  • C
    $Co$
  • D
    $Ni$
Answer
Correct option: A.
$Cr$
(a) ; $Fe , Co$ and $Ni$ are ferromagnetic substances, Chromium (Cr) is not a ferromagnetic substance.
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MCQ 901 Mark
Calculate the density of metal having molar mass $210 g mol ^{-1}$ that forms simple cubic unit cell $\left(a^3 \cdot N_A=21.5 cm ^3 mol ^{-1}\right)$
  • ✓
    $9.77 g cm ^{-3}$
  • B
    $7.15 g cm ^{-3}$
  • C
    $8.12 g cm ^{-3}$
  • D
    $6.94 g cm ^{-3}$
Answer
Correct option: A.
$9.77 g cm ^{-3}$
(a) : $M=210 g mol ^{-3} ; a^3 \cdot N_A=21.5 cm ^3 mol ^{-1}$
$Z=1$ (For simple cubic)
$d=\frac{Z \cdot M}{a^3 \cdot N_A}=\frac{1 \times 210}{21.5}=9.77 g cm ^{-3}$
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MCQ 911 Mark
Calculate the volume of unit cell if an element having molar mass $56 g mol ^{-1}$ that forms $b c c$ unit cells. $\left[\rho . N_A=4.8 \times 10^{24} g cm ^{-3} mol ^{-1}\right]$
  • A
    $1.17 \times 10^{-23} cm ^3$
  • B
    $4.79 \times 10^{-23} cm ^3$
  • C
    $3.31 \times 10^{-23} cm ^3$
  • ✓
    $2.33 \times 10^{-23} cm ^3$
Answer
Correct option: D.
$2.33 \times 10^{-23} cm ^3$
(d) $: \rho=\frac{Z \times M}{N_4 a^3}, Z=2$ (For bcc)
$\Rightarrow a^3=\frac{Z \times M}{N_d \rho}=\frac{2 \times 56}{4.8 \times 10^{24}}=2.33 \times 10^{-23} cm ^3$
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MCQ 921 Mark
In an ionic crystalline solid atoms of element $Y$ forms hcp structure. The atoms of element $X$ occupy one third of tetrahedral voids. What is the formula of compound?
  • ✓
    $X_2 Y_3$
  • B
    $X Y$
  • C
    $X_3 Y_2$
  • D
    $X Y_2$
Answer
Correct option: A.
$X_2 Y_3$
(a) : Let the number of $Y$ atoms $=n$
The number of $X$ atoms $=2 n \times \frac{1}{3}=\frac{2 n}{3}$
$\therefore$ Formula of cempound $=X_{\frac{2 v}{3}} Y_n=X_2 Y_3$
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MCQ 931 Mark
What is total number of crystal systems associated with 14 Bravais lattices?
  • ✓
    7
  • B
    14
  • C
    1
  • D
    3
Answer
Correct option: A.
7
(a) $: 7$ crystal systems are associated with 14 Bravais lattices.
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MCQ 941 Mark
Which of the following statements is not true about polymorphism?
  • A
    Polymorphism occurring in elements is called allotropy.
  • B
    $NaF$ and $MgO$ are polymorphous compounds.
  • C
    Single substance that exists in two or more forms is said to be polymorphous.
  • D
    Fullerene is a polymorphic form of carbon.
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MCQ 951 Mark
Calculate the number of unit cells in 3 gram metal that crystallises to simple cubic unit cell having edge length $336 pm$. (density of metal $=9.4 g cm ^{-3}$ )
  • ✓
    $8.41 \times 10^{21}$
  • B
    $6.25 \times 10^{21}$
  • C
    $7.15 \times 10^{21}$
  • D
    $5.82 \times 10^{21}$
Answer
Correct option: A.
$8.41 \times 10^{21}$
(a) : Valume of the unit cell $=(336 pm )^3$
$
=\left(336 \times 10^{-10} cm \right)^3=3.8 \times 10^{-23} cm ^3
$
Volume of $3 g$ of the element $=\frac{\text { Mass }}{\text { Density }}$
$
=\frac{3 g }{9.4 g ^{\prime} cm ^3}=0.32 cm ^3
$
$\therefore \quad$ Number of unit cells in this volume
$
=\frac{0.32}{3.8 \times 10^{-23}}=0.0842 \times 10^{23}=8.42 \times 10^{21}
$
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MCQ 961 Mark
The substances which are weakly repelled by the magnetic field are
  • A
    diamagnetic
  • B
    paramagnetic
  • C
    ferromagnetic
  • D
    antiferromagnetic.
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MCQ 971 Mark
Percentages of free space in cubic close packed structure and in body centred packed structure are respectively
  • A
    $32 \%$ and $48 \%$
  • B
    $48 \%$ and $26 \%$
  • C
    $30 \%$ and $26 \%$
  • ✓
    $26 \%$ and $32 \%$
Answer
Correct option: D.
$26 \%$ and $32 \%$
(d): Percentages of free space in $\alpha c p$ and boc are respectively $26 \%$ and $32 \%$.
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MCQ 981 Mark
Which among the following compounds in crystalline form is used for making Nicol's prism?
  • A
    $CaSO _4$
  • B
    $Na _2 AlF _6$
  • C
    $CaCO _3$
  • D
    $Al _2 O _3$
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MCQ 991 Mark
Which among the following metals crystallises as a simple cube?
  • ✓
    Polonium
  • B
    Iron
  • C
    Copper
  • D
    Gold
Answer
Correct option: A.
Polonium
(a) : Polonium crystallises in a simple cubic structure.
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