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41. Define non-stiochiometry defect in crystals?

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42. What is the arrangement of Zn²⁺ and S^2– ions in Zinc blende (ZnS) crystal structure?

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43. explain the effect of Frenkel structural defect on the electrical conductance of a crystalline solid?

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44. An ionic compound AB₂ possess CaF₂type crystal structure. What the co-ordination number of A²⁺ and B^– ions in crystal of AB₂ explain.

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45. What kind point defect lowers the density of a crystal?

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46. What do you mean by ‘point defects' in crystals?

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47. Define dislocation in crystals.

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48. Explain the term ‘dislocations’ in relation to crystals?

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49. Why does zinc oxide exhibit enhanced electrical conductivity on heating?

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In a body centred unit cell diagonal contain two extra atom .so in per unit cell = $8 \times \frac{1}{8} + 2 = 3 .$

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