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51. An element occurs in the bcc structure. How many atoms are present in its unit cell explain ?

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52. What is the number of atoms per unit cell in a body centred cubic structure?

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53. What are lattice defects imperfection?

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54. what is Frenkel defect.Why is Frenkel defect found in AgCl ?

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55. What type of void are developed in hexagonal close packing?

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56. What is the co-ordination number of an octahedral void?

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57. Give two exampls of the compounds that exhibit Schottky defect.

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58. What are interstitials in a crystal?

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59. What will happen if NaCl crystal is subjected to high pressure?

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60. What is unit cell.

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