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The Solid State

Short 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?

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74. In which compound Schottky and Frenkel defects are present together?

Silver bromide (AgBr) has both Schottky and Frenkel defects 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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