The Solid State

Short Answer Type

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Explain Ionic solids are hard and brittle. 

 In ionic solids, constituent particles are held together with strong electrostatic force of attraction along with their fixed position. The fixed position of ions and strong electrostatic force of attraction make ionic solids hard and brittle.
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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 ZnO becomes yellow on heating.
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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 Cation vacancies in some crystals make them good catalysts.
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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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    Give reasons for Solids with F-centres are paramagnetic?
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    How will you distinguish between the following pairs of terms:
    Crystal lattice and unit cell?

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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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