The Solid State

Short Answer Type

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

The catalytic activity dependsvery much on the surface area per unit mass of the sample.
Transition metal corresponds show metal deficiency due to absence of metal ion from its lattice. The charge is balanced by an adjacent ion having higher positive charge which ultimately increases chemisorption.
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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 will you distinguish between the following pairs of terms:
    Tetrahedral void and octahedral void?

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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 the basis of similarities and differences between metallic and ionic crystals.

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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

    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 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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