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Quiz 2
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Q.1
The number of nearest particles which is in direct contact with a particle in a closed packed structure
Unit Cell
Void
Packing efficiency
Coordination number
Q.2
Which of the following is a network solid?
SO2(Solid)
I2(Solid)
Diamond
H2O(Ice)
Q.3
In both HCP and CCP the coordination number is
12
6
4
10
Q.4
A. Ionic solids are hard and brittle. B. Covalent solids are good conductors.
A and B are correct.
A is correct
B is correct
Both A and B are wrong
Q.5
What is the packing efficiency of FCC unit cell ?
52.4%
74%
68%
None of these
Q.6
A compound is formed by A and B in which A occupies all corners and B occupies all face centres. What is the formula of the compound?
AB
AB3
A3B
A3B2
Q.7
Which compound show both Schottky and Frenkel defect?
NaBr
KBr
AgBr
AgCl
Q.8
If Z is the number of atoms in the cell that represents the closest packing sequence ABCABC.......... the number of tetrahedral voids in the unit cell is
Z
2Z
Z/2
Z/4
Q.9
Percentage of free space in BCC unit cell is
34%
28%
30%
32%
Q.10
What is the Coordination numberof an atom in FCC or CCP structure ?
4
6
8
12
Q.11
If the radius of the octahedral void is r and radius of the atoms in closepacking is R, What is the ratio between r and R.
0.225
0.414
0.732
0.889
Q.12
What is the smallest repetitive unit of the crystal / lattice structure known as?
Atom
Molecule
Lattice Point
Unit Cell
Q.13
In METAL EXCESS DEFECTS the sites where an electron gets trapped in the anionic vacancy disturbing the ratio of cation to anion is known as
E- CENTRE
F- CENTRE
G- CENTRE
I- CENTRE
Q.14
Based on the nature of intermolecular forces, classify the following solids : Silicon carbide
Ionic solid
Covalent solid
Molecular solid
Metallic solid
Q.15
Which of the following is an amorphous solid?
Copper(Cu)
Quartz glass (SiO2)
Silicon carbide (SiC)
Sodium Chloride (NaCl)
Q.16
Analysis shows that FeO has a non-stoichiometric composition with formula Fe0·95O. Give reason.
Schottky defect
Frenkel defect
Metal excess defect
Metal deficiency defect
Q.17
An element ‘X’ (At. mass =g mol–having f.c.c. structure, has unit cell edge length ofpm. Calculate the density of ‘X’ .
4.15 gcm-3
4.15 gcm3
41.5 gcm-3
0.415 gcm-3
Q.18
Which of the following is a network solid or covalent crystalline solid?
Diamond (C)
H2O (Ice)
Calcium Fluoride (CaF2)
Iron Metal (Fe)
Q.19
Gold (atomic radius = 0.nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?
0.607 nm
0.407 nm
6.07 nm
4.07 nm
Q.20
The type of crystalline solid which is a good conductor in solid as well as molten state?
Ionic Solid
Metallic Solid
Covalent Solid
Molecular Solid
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