This set of Ceramics Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Structure of Ceramics”.
1. Rock salt has which type of structure?
a) FCC
b) BCC
c) A-X type of crystal structure
d) SCC
View Answer
Explanation: Rock salt is actually a mineral composed of maximum percentage of sodium chloride. In this structure, one atom of sodium bonds with one atom of chlorine. Therefore, the structure is A-X type.
2. What is the coordination number of cations and anions in sodium chloride?
a) 6, 6
b) 6, 12
c) 12, 12
d) 8, 6
View Answer
Explanation: One sodium atom is surrounded by 6 other neighboring atoms therefore its coordination number is 6. Similarly, chlorine atom is surrounded by 6 other neighboring atoms giving coordination number 6.
3. What is the coordination number of cations and anions in cesium chloride?
a) 8, 6
b) 6, 6
c) 12, 6
d) 8, 8
View Answer
Explanation: One cesium atom is surrounded by 8 other neighboring atoms therefore its coordination number is 8. Similarly, chlorine atom is surrounded by 8 other neighboring atoms giving coordination number 8.
4. Zinc blende and Wurtzite have same structure.
a) True
b) False
View Answer
Explanation: Zinc sulphide exists in two polymorphs which are zinc blende and Wurtzite. Wurtzite has a hexagonal closed packed structure and zinc blende has FCC structure.
5. What position do zinc atoms occupy in Wurtzite?
a) Face center
b) Corners
c) Tetrahedral holes
d) Octahedral holes
View Answer
Explanation: Wurtzite has a hexagonal closed packed structure. As zinc atoms are small in size, they occupy tetrahedral voids in the structure.
6. Which type of structure does rutile have?
a) Tetragonal
b) Cubic
c) FCC
d) BCC
View Answer
Explanation: Rutile is a mineral composed of titanium dioxide. Rutile has got tetragonal crystal structure in which titanium atoms coordination number 6 and oxygen atoms have coordination number 3.
7. What is the structure of lithium oxide?
a) FCC
b) BCC
c) Fluorite
d) Anti-fluorite
View Answer
Explanation: Anti-fluorite is opposite of fluorite structure in which there is cubic close-packed array of oxygen anions and cations in tetrahedral sites. Lithium oxide has this kind of structure.
8. What is the number of octahedral sites in a FCC lattice?
a) 0
b) 2
c) 4
d) 6
View Answer
Explanation: One edge in an FCC lattice is shared by 4 lattices. There are 12 edges. Thus total number of voids from edges is 3. There is an octahedral void at the very center of the lattice. That makes it 4.
9. What is the number of octahedral sites in BCC lattice?
a) 0
b) 6
c) 4
d) 10
View Answer
Explanation: One edge in BCC lattice is shared by 4 lattices. There are 12 edges. Thus total number of voids from edges is 3. There are 6 faces shared by 2 lattices. This makes it 6.
10. Radius ratio of 0.63 represents _______
a) Octahedral coordination
b) Linear coordination
c) Tetragonal coordination
d) Cubic coordination
View Answer
Explanation: Radius ratio is the ionic ratio of cation to anion. Octahedral coordination represents radius ratio between 0.414 – 0.732. Rutile is one of the examples.
Sanfoundry Global Education & Learning Series – Ceramics Engineering.
To practice all areas of Ceramics Engineering, here is complete set of Multiple Choice Questions and Answers.
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