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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?

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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?

Frenkel defect tends to increase the dielectric constant of the crystal. Compounds having such defect conduct electricity to a small extent. When electric field is applied, an ion moves from its lattice site to occupy a hole, it creates a new hole. In this way, a hole moves from one end to the other. Thus, it conducts electricity across the crystal. Due to the presence of holes, stability (or the lattice energy) of the crystal decreases.

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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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