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

    For tetrahedrtal coordination Radius ratio is 0.225-0.414.
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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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    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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