Long Answer Type'Stability of a crystal is reflected in the magnitude of its melting points. Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the inter molecular forces between these molecules?
Short Answer TypeHow will you distinguish between the following pairs of terms:
Hexagonal close-packing and cubic close-packing?
How will you distinguish between the following pairs of terms:
Crystal lattice and unit cell?
How will you distinguish between the following pairs of terms:
Tetrahedral void and octahedral void?
Solution:
(i) One unit cell of a face-centered cubic has 8 lattice points are corners and 6 lattice points at faces, total 14 lattice points.
(ii) One unit cell of face-centered tetragonal has 8 lattice points are corners and 6 lattice points at faces, total 14 lattice points.
(iii) One unit cell of body centered has 8 lattice points are corners and 1 lattice points at faces, total 9 lattice points.
Explain the basis of similarities and differences between metallic and ionic crystals.
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