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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?

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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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Number of cations A⁺ at the corners of the unit cell is

= \frac{1}{8} \times 8 = 1 .

Number of anions B^–at the centre of unit cell is=1
Therefore, simplest formula of the substance = AB.

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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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