An element with molar mass 2.7 x 10–2 kg mol–1&n

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 Multiple Choice QuestionsShort Answer Type

11. Name the parameters that characterize a unit cell.
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12. Distinguish between Hexagonal and monoclinic unit cells.
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13. Distinguish between Face-centred and end-centred unit cells.
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14. Explain how much portion of an atom located at (i) corner and (ii) body-centre of a cubic unit cell is part of its neighbouring unit cell.
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15. What is the two-dimensional coordination number of a molecule in square close packed layer ?
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16. A compound forms hexagonal closed-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?
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17. A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3 of tetrahedral voids. What is the formula of the compound?
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 Multiple Choice QuestionsMultiple Choice Questions

18. Which of the following lattices has the highest packing efficiency:
  • simple cubic 
  • body-centred cubic

  • hexagonal close packed lattice
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 Multiple Choice QuestionsShort Answer Type

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19. An element with molar mass 2.7 x 10–2 kg mol–1 form a cubic unit cell with edge length 405 pm. If its density is 2.7 x 103 kg m–3. What is the nature of the cubic unit cell?


straight Z equals fraction numerator straight d cross times straight a cubed cross times straight N subscript straight A over denominator straight M end fraction

Hence, the nature of the cubic unit cell is ccp.
Hence, the nature of the cubic unit cell is ccp.
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20. What type of defect can arise when a solid is heated? Which physical property is affected by it and in what way?
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