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The Solid State

Short Answer Type

61. For tetrahedral co-ordination, what should be the range of radius ratio (r⁺/r^–) value?

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62. What type of structure possessed by a unit cell of CsCl.

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63. What is the effect of increasing temperature on the conductivity of semi-conductors?

In case of semiconductors, the gap between the valence band and conduction band is small Therefore, some electrons may jump to conduction band and show some conductivity. Electrical conductivity of semiconductors increases with rise in temperature, since more electrons can jump to the conduction band.

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64. Define radius ratio. What is the ideal value for a tetrahedral void?

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65. How in the crystal of zinc sulphide, zinc occupies tetrahedral voids. What is the coordination number of zinc?

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66. What is point defects in solids.

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67. What type of compounds exhibit Schottky defect?

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68. The unit cell of a substance has cation A⁺ at the corners of the unit cell and anions B^- the centre. What is the simplest formula of the the substance?

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69. What is the co-ordination number of each ion in Na₂O.

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70. Why is an ionic crystal of NaCl a nonconductor explain?

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