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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?

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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.

Point defects can be define as the irregularities or deviations from ideal arrangement around a point or an atom in a crystalline substance.
Point defects can be classified into three types : (i) stoichiometric defects (ii) impurity defects and (iii) non-stoichiometric defects.

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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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