This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Crystal Structure of Ceramics”.
1. Which of the following is false about ceramic structures?
a) They are made up of two or more different elements
b) More complex than metal structures
c) They are electrically neutral
d) Less complex than metal structures
View Answer
Explanation: Ceramic structures are electrically neutral, more complex than metallic structures and are made up of two or more different elements.
2. Which of the following bonds are present in ceramic structures?
a) Ionics bonds only
b) Covalent bonds only
c) Ionic, covalent and a mix of ionic and covalent bond
d) Mix of ionic and covalent bond only
View Answer
Explanation: Ceramic structures have ionic bonds, covalent bonds. They show a mix of covalent and ionic bonds in some cases.
3. What is the cation to anion ratio for a ceramic having coordination number 2?
a) <0.155
b) 0.155-0.225
c) 0.414-0.732
d) 0.732-1.0
View Answer
Explanation: The cation to anion ratio for a ceramic having coordination number 2 is less than 0.155. For the given coordination number, the coordination geometry is also fixed.
4. What is the cation to anion ratio for a ceramic having coordination number 3?
a) <0.155
b) 0.155-0.225
c) 0.414-0.732
d) 0.732-1.0
View Answer
Explanation: The cation to anion ratio for a ceramic having coordination number 3 lies in the range of 0.155 to 0.225. For the given coordination number, the coordination geometry is also fixed.
5. What is the cation to anion ratio for a ceramic having coordination number 6?
a) <0.155
b) 0.155-0.225
c) 0.414-0.732
d) 0.732-1.0
View Answer
Explanation: The cation to anion ratio for a ceramic having coordination number 6 lies in the range of 0.414 to 0.732. For the given coordination number, the coordination geometry is also fixed.
6. What is the cation to anion ratio for a ceramic having coordination number 8?
a) <0.155
b) 0.155-0.225
c) 0.414-0.732
d) 0.732-1.0
View Answer
Explanation: The cation to anion ratio for a ceramic having coordination number 8 lies in the range of 0.732 to 1.0. For the given coordination number, the coordination geometry is also fixed.
7. Which of the following compounds have a coordination number of 8?
a) Cesium chloride
b) Sodium chloride
c) Zinc blende
d) Calcium fluoride
View Answer
Explanation: Cesium chloride has a coordination number of 8 while coordination number of sodium chloride and zinc blende are 6 and 4 respectively. Calcium chloride has a different coordination number for its anion and cation.
8. The coordination number of fluorine in calcium fluoride is?
a) 8
b) 6
c) 2
d) 4
View Answer
Explanation: The calcium atoms are in the center and the fluorine atoms are at the corners of the cube and therefore only half sites are filled with calcium atoms and coordination number of fluorine id 4 and that of calcium is 8.
9. The geometry of a material with coordination number 6 is a tetrahedron.
a) True
b) False
View Answer
Explanation: The above statement is false. The geometry of a material with coordination number 6 is octahedron and tetrahedron is the geometry of a material with coordination number 4.
10. Cesium chloride has an FCC structure.
a) True
b) False
View Answer
Explanation: The above statement is false. Cesium chloride has a simple cubic structure with a coordination number of 8.
Sanfoundry Global Education & Learning Series – Materials Science.
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