The Solid State

Short Answer Type

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How will you distinguish between the following pairs of terms:
Tetrahedral void and octahedral void?

The void created by six spheres in contact is called an octahedreal v

The void created by six spheres in contact is called an octahedreal void Fig. 1.21. (a) and void created by the four spheres in contact is called a tetrahedral void Fig. 1.21 (b).
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    How will you distinguish between the following pairs of terms:
    Hexagonal close-packing and cubic close-packing?

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    How many lattice points are there in one unit cell of each of the following lattice?
    (i) face centered cubic
    (ii) face centered tetragonal
    (iii) body centered.
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    Explain the basis of similarities and differences between metallic and ionic crystals.

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    Give reasons for Solids with F-centres are paramagnetic?
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    Give reasons for ZnO becomes yellow on heating.
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    Explain Ionic solids are hard and brittle. 

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    How will you distinguish between the following pairs of terms:
    Crystal lattice and unit cell?

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    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?

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    Short Answer Type

    Give reasons for Cation vacancies in some crystals make them good catalysts.
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