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The Solid State

Short Answer Type

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

body centre wholly belongs to the unit cell in which it is present. Thus in a body-centered cubic (bcc) unit cell:
(i) 8 corners × 1/8 per corner atom

8 \times 1 / 8

= 1 atom
(ii) 1 body centre atom = 1 × 1 = 1 atom
∴ Total number of atoms per unit cell = 2 atoms.

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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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