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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