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    The Solid State
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    Give one example of anti ferroelectric solid and one example of ferroelectric solid.

    Antiferro electric solid-PbZrO3 (Lead Zirconate).
    Ferro electric solid-BaTiO3 (Barium Titanate).
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    What happens when CdCl2 is added to AgCl?
    When AgCl is doped with CdCl2 a cation vacancy defect is created i.e. An Ag+ ion from the lattice is absent its position due to presence of adjacent Cd++ ion.
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    In which compound  Schottky and Frenkel defects are present together?
    Silver bromide (AgBr) has both Schottky and Frenkel defects together.
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    What is the percentage of free space in a body centred cubic crystal?
    In body centred cubic crystal packing effciency is 68% thus free space in body centred cubic crystal is free space effciency = 100- 68%
                                  = 32%
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    Name the solid substance in which cations occupy all the tetrahedral voids.
     Na2O is the solid in which cation occupy all the tetrahedral voids. in Na2O, Na+ ion is surrounded by four oxide ion and oxide ion surrounded by the eight sodium ion.
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