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Chemistry MCQ

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

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MCQ 11 Mark
The edge length of a bcc unit cell of a metallic crystal is $2.9 \mathring A$. Hence the diameter of an atom is
  • ✓
    $1.025 \mathring A$
  • B
    $2.512 \mathring A$
  • C
    $1.45 \mathring A$
  • D
    $1.31 \mathring A$
Answer
Correct option: A.
$1.025 \mathring A$
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MCQ 21 Mark
What is the edge length of simple cubic unit cell if radius of atom is $174 \mathrm{pm}$ ?
  • ✓
    $348 \mathrm{pm}$
  • B
    $402 \mathrm{pm}$
  • C
    $492 \mathrm{pm}$
  • D
    $174 \mathrm{pm}$
Answer
Correct option: A.
$348 \mathrm{pm}$
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MCQ 31 Mark
Identify the type of unit cell containing single particle
  • A
    Body centred cubic
  • B
    Base centred cubic
  • C
    Face centred cubic
  • ✓
    Simple cubic
Answer
Correct option: D.
Simple cubic
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MCQ 41 Mark
Calculate the molar mass of metal having density $7.8 \mathrm{~g} \mathrm{~cm}^{-3}$ and crystallizes to form bcc structure with edge length $288 \mathrm{pm}$.Q
  • A
    $120.0 \mathrm{~g} \mathrm{~mol}^{-1}$
  • B
    $86.2 \mathrm{~g} \mathrm{~mol}^{-1}$
  • C
    $108.1 \mathrm{~g} \mathrm{~mol}^{-1}$
  • ✓
    $56.1 \mathrm{~g} \mathrm{~mol}^{-1}$
Answer
Correct option: D.
$56.1 \mathrm{~g} \mathrm{~mol}^{-1}$
D
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MCQ 51 Mark
Lithium forms BCC structure having edge length of unit cell 351 pm then atomic radies of lithium is
  • A
    75 Pm
  • B
    210 Pm
  • C
    180 Pm
  • ✓
    152 Pm
Answer
Correct option: D.
152 Pm
D
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MCQ 61 Mark
Edge length of unit cell of a crystal is $288 \mathrm{pm}$. If it's density is $7.2 \mathrm{~g} \mathrm{~cm}^{-3}$ determine the type of unit cell ( at. mass $=52$ ).
  • A
    primitive cubic
  • B
    Face centred cubic
  • C
    Simple cubic close
  • ✓
    Body centred cubic
Answer
Correct option: D.
Body centred cubic
D
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MCQ 71 Mark
If $\mathrm{M}$ is atomic mass of element and a is edge length of unit cell then the formula to calculate density is
  • A
    $\rho=\frac{a^3 N_A}{n \times M}$
  • B
    $\rho=\frac{M N_A}{a^3 n}$
  • C
    $\rho=\frac{a^3 M}{n N_A}$
  • ✓
    $\rho=\frac{n M}{a^3 N_A}$
Answer
Correct option: D.
$\rho=\frac{n M}{a^3 N_A}$
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MCQ 81 Mark
Which among the following is NOT ferromagnetic in nature?
  • ✓
    $\mathrm{Zn}$
  • B
    $\mathrm{Ni}$
  • C
    $\mathrm{Co}$
  • D
    $\mathrm{Fe}$
Answer
Correct option: A.
$\mathrm{Zn}$
A
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MCQ 91 Mark
Which among the following statements is NOT true about covalent network solid?
  • ✓
    These are soft in nature.
  • B
    The atoms in this solid are linked by covalent bonds.
  • C
    In this solid the constituent particles are atoms.
  • D
    Covalent solids have high melting points.
Answer
Correct option: A.
These are soft in nature.
A
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MCQ 101 Mark
Which among the following statements is NOT true about Frenkel defect?
  • A
    The crystal as whole remains electrically neutral because equal number of cations and anions are present.
  • B
    The density of solid crystal and it's chemical properties remain unchanged as no ions are missing from the crystal lattice as a whole.
  • ✓
    It occurs in ionic compounds with sizes of cations and anions almos equal.
  • D
    The ions of ionic compound must have low co-ordination number.
Answer
Correct option: C.
It occurs in ionic compounds with sizes of cations and anions almos equal.
C
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MCQ 111 Mark
Calculate the number of unit cells in 3 gram metal that crystallises to simple cubic unit cell having edge length $336 \mathrm{pm}$. (density of metal $=9.4 \mathrm{~g} \mathrm{~cm}^{-3}$ )
  • A
    $7 \cdot 15 \times 10^{21}$
  • B
    $5 \cdot 82 \times 10^{21}$
  • ✓
    $8 \cdot 41 \times 10^{21}$
  • D
    $6 \cdot 25 \times 10^{21}$
Answer
Correct option: C.
$8 \cdot 41 \times 10^{21}$
C
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MCQ 121 Mark
Calculate the mass of bcc unit cell if metal has molar mass $56 \mathrm{~g} \mathrm{~mol}^{-1}$.
  • ✓
    $1.86 \times 10^{-22}$ gram
  • B
    $9.3 \times 10^{-24} \mathrm{gram}$
  • C
    $2.79 \times 10^{-24}$ gram
  • D
    $3.72 \times 10^{-22}$ gram
Answer
Correct option: A.
$1.86 \times 10^{-22}$ gram
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MCQ 131 Mark
What is the co-ordination number of a particle in fcc crystal lattice?
  • A
    4
  • B
    6
  • ✓
    12
  • D
    8
Answer
Correct option: C.
12
C
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MCQ 141 Mark
Which of the following statements is NOT true about Schottky defect?
  • A
    It occurs in ionic compounds with sizes of cation and anion almost equal.
  • B
    The ions of ionic compound must have high co-ordination number.
  • C
    The density of substance decreases.
  • ✓
    The electrical neutrality of the compound is not preserved.
Answer
Correct option: D.
The electrical neutrality of the compound is not preserved.
D
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MCQ 151 Mark
Identify unit cell from following having four particles in it.
  • A
    Body centred cubic
  • B
    Simple cubic
  • ✓
    Face centred cubic
  • D
    Base centred cubic
Answer
Correct option: C.
Face centred cubic
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MCQ 161 Mark
Find the molar mass of an element that crystallizes forming unit cell structure having edge length $4 \times 10^{-8} \mathrm{~cm}$ and containing 4 particles. $\left(\mathrm{e}=19.7 \mathrm{~g} \mathrm{~cm}^{-3}\right)$
  • A
    $160 \cdot 5 \mathrm{~g} \mathrm{~mol}^{-1}$
  • B
    $220 \cdot 0 \mathrm{~g} \mathrm{~mol}^{-1}$
  • C
    $140 \cdot 2 \mathrm{~g} \mathrm{~mol}^{-1}$
  • ✓
    $189 \cdot 8 \mathrm{~g} \mathrm{~mol}^{-1}$
Answer
Correct option: D.
$189 \cdot 8 \mathrm{~g} \mathrm{~mol}^{-1}$
D
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MCQ 171 Mark
Calculate the density of metal with molar mass $56 \mathrm{~g} \mathrm{~mol}^{-1}$ that crystallises to form bcc structure with edge length $288 \mathrm{pm}$.
  • A
    $9.8 \mathrm{~g} \mathrm{~cm}^{-3}$
  • B
    $5.8 \mathrm{~g} \mathrm{~cm}^{-3}$
  • C
    $8.7 \mathrm{~g} \mathrm{~cm}^{-3}$
  • ✓
    $7.8 \mathrm{~g} \mathrm{~cm}^{-3}$
Answer
Correct option: D.
$7.8 \mathrm{~g} \mathrm{~cm}^{-3}$
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MCQ 181 Mark
What type of bonds are present in molecular crystals?
  • ✓
    Various inter molecular forces of attraction.
  • B
    Ionic bond
  • C
    Metallic bond
  • D
    Covalent bond
Answer
Correct option: A.
Various inter molecular forces of attraction.
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MCQ 191 Mark
Which of the following statements is NOT true about ionic solid?
  • A
    In this constituent particles are held together by electrostatic force of attraction.
  • B
    The constituent particles of ionic solid are cations and anions.
  • ✓
    Pure ionic solid is good conductor of electricity in solid state.
  • D
    Ionic solids are hard and brittle.
Answer
Correct option: C.
Pure ionic solid is good conductor of electricity in solid state.
C
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MCQ 201 Mark
Calculate the volume of unit cell of element with density $7.2 \mathrm{~g} \mathrm{~cm}^{-3}$ that forms bcc structure. $(288$ gram of this element contains $3.35 \times 10^{24}$ atoms$)$
  • ✓
    $2.388 \times 10^{-23} \mathrm{~cm}^3$
  • B
    $3.912 \times 10^{-23} \mathrm{~cm}^3$
  • C
    $3.038 \times 10^{-23} \mathrm{~cm}^3$
  • D
    $4.136 \times 10^{-23} \mathrm{~cm}^3$
Answer
Correct option: A.
$2.388 \times 10^{-23} \mathrm{~cm}^3$
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MCQ 211 Mark
Which of the following is an example of ionic solid?
  • A
    Silica
  • B
    ice
  • C
    sodium metal
  • ✓
    Calcium fluoride
Answer
Correct option: D.
Calcium fluoride
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MCQ 221 Mark
Calculate the density of metal which forms simple cubic structure with edge length of unit cell $336 \mathrm{pm}$. (90 gram of meal contains $2.64 \times 10^{23}$ atoms)
  • A
    $7 \cdot 3 \mathrm{~g} \mathrm{~cm}^{-3}$
  • ✓
    $8.98 \mathrm{~g} \mathrm{~cm}^{-3}$
  • C
    $9.46 \mathrm{~g} \mathrm{~cm}^{-3}$
  • D
    $10.8 \mathrm{~g} \mathrm{~cm}^{-3}$
Answer
Correct option: B.
$8.98 \mathrm{~g} \mathrm{~cm}^{-3}$
B
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MCQ 241 Mark
Calculate the density of an element with molar mass $27 \mathrm{~g} \mathrm{~mol}^{-1}$ having $4$ atoms in a unit cell with edge length $405 \mathrm{pm}$
  • A
    $3 \cdot 10 \mathrm{~g} \mathrm{~cm}^{-3}$
  • B
    $4.56 \mathrm{~g} \mathrm{~cm}^{-3}$
  • C
    $1.53 \mathrm{~g} \mathrm{~cm}^{-3}$
  • ✓
    $2.69 \mathrm{~g} \mathrm{~cm}^{-3}$
Answer
Correct option: D.
$2.69 \mathrm{~g} \mathrm{~cm}^{-3}$
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MCQ 251 Mark
What is the total volume occupied by atoms in bcc unit cell?
  • A
    0.74
  • B
    0.5236
  • ✓
    0.68
  • D
    0.8
Answer
Correct option: C.
0.68
C
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MCQ 261 Mark
What is the value of temperature in degree Celsius at absolute zero?
  • A
    $-373 \cdot 15^{\circ} \mathrm{C}$
  • B
    $0^{\circ} \mathrm{C}$
  • C
    $273\cdot 15^{\circ} \mathrm{C}$
  • ✓
    $-273 \cdot 15^{\circ} \mathrm{C}$
Answer
Correct option: D.
$-273 \cdot 15^{\circ} \mathrm{C}$
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MCQ 271 Mark
Calculate the density of metal having volume of unit cell $64 \times 10^{-24} \mathrm{~cm}^3$ and molar mass of metal $192 \mathrm{~g} \mathrm{~mol}^{-1}$ containing 4 particles in unit cell.
  • A
    $16.00 \mathrm{~g} \mathrm{~cm}^{-3}$
  • ✓
    $19.93 \mathrm{~g} \mathrm{~cm}^{-3}$
  • C
    $1492 \mathrm{~g} \mathrm{~cm}^{-3}$
  • D
    $18.00 \mathrm{~g} \mathrm{~cm}^{-3}$
Answer
Correct option: B.
$19.93 \mathrm{~g} \mathrm{~cm}^{-3}$
B
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MCQ 281 Mark
Calculate the number of atoms in $\mathbf{5}$ gram metal that crystallises to form simple cubic unit cell structure having edge length $336 \mathrm{pm}$.(density of metal $=9.4 \mathrm{~g} \mathrm{~cm}^{-3}$ )
  • A
    $2.1 \times 10^{22}$
  • B
    $1.8 \times 10^{22}$
  • ✓
    $1.4 \times 10^{22}$
  • D
    $1.0 \times 10^{22}$
Answer
Correct option: C.
$1.4 \times 10^{22}$
C
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MCQ 291 Mark
What is the void volume in the crystal lattice formed by bcc unit cell ?
  • A
    0.3
  • B
    0.26
  • C
    0.4764
  • ✓
    0.32
Answer
Correct option: D.
0.32
D
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MCQ 301 Mark
Calculate the molar mass of metal with density $1 \mathrm{gcm}^{-3}$ forming bcc structure with edge length $420 \mathrm{pm}$.
  • ✓
    $22 \cdot 3 \mathrm{~g} \mathrm{~mol}^{-1}$
  • B
    $25 \cdot 5 \mathrm{~g} \mathrm{~mol}^{-1}$
  • C
    $43 \cdot 3 \mathrm{~g} \mathrm{~mol}^{-1}$
  • D
    $32 \cdot 2 \mathrm{~g} \mathrm{~mol}^{-1}$
Answer
Correct option: A.
$22 \cdot 3 \mathrm{~g} \mathrm{~mol}^{-1}$
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MCQ 311 Mark
Calculate the volume of unit cell having four particles in it with density $19.0 \mathrm{~g} \mathrm{~cm}^{-3}\left[\right.$ molar mass of element $=190 \mathrm{~g} \mathrm{~mol}^{-1}$ ]
  • ✓
    $6.64 \times 10^{-23} \mathrm{~cm}^3$
  • B
    $3.32 \times 10^{-23} \mathrm{~cm}^3$
  • C
    $5.0 \times 10^{-23} \mathrm{~cm}^3$
  • D
    $2.4 \times 10^{-23} \mathrm{~cm}^3$
Answer
Correct option: A.
$6.64 \times 10^{-23} \mathrm{~cm}^3$
A
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MCQ 321 Mark
n-type semiconductor is formed when trace amount of impurity is added to silicon. The number of valence electrons in the impurity atom must be
  • A
    3
  • ✓
    5
  • C
    1
  • D
    2
Answer
Correct option: B.
5
B
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MCQ 331 Mark
p-type semiconductor is formed when trace amount of impurity is added to silicon. The number of valence electrons in the impurity atom must be
  • ✓
    3
  • B
    5
  • C
    1
  • D
    2
Answer
Correct option: A.
3
A
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MCQ 341 Mark
Semiconductors are manufactured by addition of impurities of
  • ✓
    p-block elements
  • B
    actinoids
  • C
    Lanthanoids
  • D
    s-block elements
Answer
Correct option: A.
p-block elements
A
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MCQ 361 Mark
The arrangement of layers in hexagonal close packing is
  • A
    ABCABC
  • ✓
    ABAB
  • C
    ABBABBA
  • D
    ABBCABBC
Answer
Correct option: B.
ABAB
B
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MCQ 371 Mark
An element crystallises in fee structure. If the atomic radius is 130 pm, the edge length of unit cell is
  • A
    332.5 pm
  • B
    410 pm
  • C
    390 pm
  • ✓
    367.6 pm
Answer
Correct option: D.
367.6 pm
D
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MCQ 381 Mark
The edge length of a bcc unit cell of a metallic crystal is 2.9 Å. Hence the diameter of an atom is
  • A
    1.025 Å
  • ✓
    2.512 Å
  • C
    1.45 Å
  • D
    1.31 Å
Answer
Correct option: B.
2.512 Å
B
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MCQ 391 Mark
An element having atomic mass 115 u, crystallises in bcc structure. The number of unit cells in 1 g of the element will be
  • ✓
    $2.6 \times 10^{21}$
  • B
    $3.8 \times 10^{23}$
  • C
    $8.7 \times 10^{-3}$
  • D
    $6.17 \times 10^{20}$
Answer
Correct option: A.
$2.6 \times 10^{21}$
A
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MCQ 401 Mark
The unit cell has an edge length 403 pm. The distance between two atoms placed opposite ends of body diagonal will be
  • A
    806 pm
  • B
    201.5 pm
  • ✓
    698 pm
  • D
    578 pm
Answer
Correct option: C.
698 pm
C
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MCQ 411 Mark
Edge length of a cubic unit cell is 354 pm. The distance between two atoms diagonally opposite on the face is
  • ✓
    500 pm
  • B
    354 pm
  • C
    708 pm
  • D
    627 pm
Answer
Correct option: A.
500 pm
A
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MCQ 421 Mark
An element crystallises in fee structure. If the atomic mass of the element is 72.7 U, the mass of one unit cell of it will be
  • A
    $2.9 \times 10^{-24} g$
  • ✓
    $4.83 \times 10^{-25} kg$
  • C
    $1.2 \times 10^{-22} g$
  • D
    $2.41 \times 10^{-24} kg$
Answer
Correct option: B.
$4.83 \times 10^{-25} kg$
B
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MCQ 431 Mark
Stron The mass of a unit cell of a body centred cubic crystal of a metal is $72.2 \times 10^{-23} g$. The atomic mass of the metal is
  • A
    $128.6 gmol ^{-1}$
  • B
    $108.7 gmol ^{-1}$
  • ✓
    $217.3 gmol ^{-1}$
  • D
    $57.86 gmol ^{-1}$
Answer
Correct option: C.
$217.3 gmol ^{-1}$
C
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MCQ 441 Mark
Gold crystallises in face centred cubic structure. If atomic mass of gold is $197 g mol ^{-1}$, the mass of the unit cell of gold will be
  • A
    $3.25 \times 10^{-23} kg$
  • B
    $6.5 \times 10^{-23} kg$
  • C
    $3.9 \times 10^{-24} kg$
  • ✓
    $1.3 \times 10^{-24} kg$
Answer
Correct option: D.
$1.3 \times 10^{-24} kg$
D
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MCQ 451 Mark
If all the lattice points in ccp structure namely comers, face and edge centres and body centre are occupied by atoms then the total number of atoms in the unit cell will be
  • ✓
    8
  • B
    12
  • C
    14
  • D
    16
Answer
Correct option: A.
8
A
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MCQ 461 Mark
Copper crystallises in face centred cubic structure. If the unit cell length is 360 pm, the radius of copper atom is
  • A
    180 pm
  • B
    156 pm
  • ✓
    127 pm
  • D
    110 pm
Answer
Correct option: C.
127 pm
C
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MCQ 471 Mark
The volume of unit cell of a metallic crystal of bcc type is $8.4 \times 10-23 cm 3$. The volume occupied by $10$ atoms in the crystalline structure is
  • A
    $4.2 \times 10^{-22} cm^3$
  • B
    $3.12 \times 10^{-23} cm^3$
  • C
    $1.74 \times 10^{-23} cm^3$
  • ✓
    $2.856 \times 10^{-22} cm^3$
Answer
Correct option: D.
$2.856 \times 10^{-22} cm^3$
D
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MCQ 481 Mark
A metallic element crystallises in face centred cubic structure. If the radius of metal ion is 0.92 Å, the edge length of the unit cell of the crystal is
  • A
    0.8464 Å
  • B
    1.252 Å
  • C
    5.187 Å
  • ✓
    2.6 Å
Answer
Correct option: D.
2.6 Å
D
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MCQ 501 Mark
The substances which can be permanently magnetised are
  • A
    diamagnetic
  • B
    paramagnetic
  • ✓
    ferromagnetic
  • D
    non-magnetic
Answer
Correct option: C.
ferromagnetic
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