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 Questions
18.Which of the following lattices has the highest packing efficiency:
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?
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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