81.Name a salt that can be added to AgCl so as to produce cation vacancies.
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82.
How many lattice points are there in one unit cell of each of the following lattice? (a) face centred cubic (b) face centred tetragonal (c) body centred cubic
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83.Find out the number of atoms per unit cell in a face-centred cubic structure having only single atoms at its lattice points.
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84.What makes alkali metal halides sometimes coloured, which are otherwise colourless?
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85.What is the difference between ccp and fcc lattice?
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86.What percent of space is utilised by spheres in (i) simple cubic, (ii) face-centered cubic, (iii) body-centered cubic structure?
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87.If three elements A, B and C crystallize in a cubic solid lattic with A atom at the corner, B atoms at cube centre and C atoms at edges then what would be the formula of the solid?
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88.Out of Schottky and Frenkel defect which increases the dielectric constant of crystals?
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