What are non-stoichiometric compounds? from Chemistry The Solid S

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 Multiple Choice QuestionsShort Answer Type

71. What causes the conduction of electricity by semi-conductors?
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72. What may be the difference between phosphorus doped and gallium doped semiconductors?
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73. What are non-stoichiometric compounds?


Non-stoichiometric compounds are chemical compounds, almost always solid inorganic compounds, having elemental composition whose proportions cannot be represented by integers; most often, in such materials, some small percentage of atoms are missing or too many atoms are packed into an otherwise perfect lattice work. exaple FeO, ZnO etc.
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74. In which compound  Schottky and Frenkel defects are present together?
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75. What is the percentage of free space in a body centred cubic crystal?
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76. Give one example of anti ferroelectric solid and one example of ferroelectric solid.
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77. What happens when CdCl2 is added to AgCl?
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78. Name the solid substance in which cations occupy all the tetrahedral voids.
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79. What is the effect of Frenkel defect on electrical conductivity of the solid?
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80. Mention one property which is caused due to the presence of F-centre in a solid.
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