80
Minutes
59
Questions
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Marking
Q1. Chottky defect defines imperfection in the lattice structure of
solid
gas
liquid
plasma
Q2. An type structure is found in
NaCl
Q3. An element (atomic mass ) having structure has unit cell edge . The density of element is (No. of atoms in , )
Q4. What is the coordination number of sodium in ?
6
4
8
2
Q5. The compound, found in nature in gas phase but ionic in solid state is
Q6. The and are located in crystal, respectively at face centred cubic lattice points and in
Tetrahedral voids
Half of tetrahedral voids
Octahedral voids
Half of octahedral voids
Q7. The coordination number in is
6
12
18
24
Q8. The space lattice of graphite is
Cubic
Tetragonal
Rhombic
Hexagonal
Q9. Coordination numbers of and in the crystal structure of wurtzite are
4, 4
6, 6
8, 4
8, 8
Q10. Gold has a face centred cubic lattice with an edge length of the unit cube of . Assuming the closest packing, the diameter of the gold atom is
Q11. Which is not correct about the Schottky defects?
Both cations and anions are missing from their lattice sites without affecting the stoichiometry of the compound
Because of presence of holes the lattice energy decreases.
The presence of holes causes the density of the crystal to decrease.
The defect increases the electrical of the ions into the holes.
Q12. The existence of a substance in more than one solid modifications is known as
isomorphism
Polymorphism
Amorphism
Allotropy
Q13. An element (atomic mass = ) having structure has unit cell edge . Then, density of the element is
Q14. If AgI crystallises in zinc blende structure with ions at lattice points. What fraction of tetrahedral voids is occupied by ions?
Q15. Which set of following characteristics for crystal is correct?
Coordination number (4 : 4); ; ion in the alternate tetrahedral voids
Coordination number (6 : 6); ; ion in all tetrahedral voids.
Coordination number (6 : 4); ; ion in all octahedral voids
Coordination number (4 : 4); ; ion in all tetrahedral voids.
...and 44 more challenging questions available in the interactive simulator.