Q4. Which of the following properties is characteristic of covalent network solids? (2019)
Solution:
Covalent network solids are typically brittle due to the strong covalent bonds that do not allow for easy deformation.
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Q5. What is the primary force holding together the atoms in metallic solids? (2020)
Solution:
Metallic solids are held together by metallic bonds, which involve a 'sea of electrons' that are free to move.
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Q6. What is the primary force holding together the atoms in a metallic solid? (2020)
Solution:
Metallic solids are held together by metallic bonds, which involve a 'sea' of delocalized electrons around positively charged metal ions.
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Q7. What type of packing is observed in a body-centered cubic (BCC) structure? (2023)
Solution:
The body-centered cubic (BCC) structure features body-centered packing, where one atom is at the center of the cube and eight atoms are at the corners.
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Q8. Which of the following is an example of a non-stoichiometric solid? (2023)
Solution:
FeO is an example of a non-stoichiometric solid because it can have varying ratios of iron and oxygen.
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Q9. What is the main characteristic of amorphous solids? (2023)
Solution:
Amorphous solids lack long-range order, which distinguishes them from crystalline solids.
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Q10. In a body-centered cubic (BCC) structure, how many atoms are there in one unit cell? (2022)
Solution:
In a body-centered cubic (BCC) structure, there are 2 atoms per unit cell (1 from the center and 1 from the corners).
