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The correct order of the packing efficiency in different types of unit cells is-
1. Fcc < Bcc < Simple cubic
2. Fcc > Bcc > Simple cubic
3. Fcc < Bcc > Simple cubic
4. Bcc < Fcc > Simple cubic
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The packing efficiency of the face-centered cubic unit cell is:
(assuming that the atoms are touching each other)
1. 52.40 %
2. 68.04 %
3. 74 %
4. 79.06 %
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The relation between the atomic mass of unknown metal with density and the dimension of its unit cell is given by :
(Given: All the cell edge lengths are equal)
1. \(m \ = \ \frac{\rho a^{3}N_{A}}{Z} \)
2. \(m \ = \ \rho a^{3}N_{A}Z\)
3. \(m \ = \ \frac{Z}{\rho a^{3}N_{A}}\)
4. \(m \ = \ \frac{ZN_{A}}{a^{3}\rho}\)
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The most efficient packing is present in -
1. HCP and BCC
2. HCP and CCP
3. BCC and CCP
4. BCC and Simple cubic cell
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Silver crystallizes in fcc lattice. If the edge length of the cell is 4.07 × 10−8 cm and density is 10.5 g cm−3, the atomic mass of silver is -
1. 120.31 g
2. 107.9 g
3. 207.60 g
4. 138.52 g
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The fraction of total volume occupied by the atoms present in a simple cube is:
1.
2.
3.
4.
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An element has a body-centered cubic (BCC) structure with a cell edge of 288 pm. The atomic radius is:
1. pm
2. pm
3. pm
4. pm
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A given metal crystallizes out with a cubic structure having an edge length of 361 pm. If there are four metal atoms in one unit cell, the radius of one atom is:
1. 40 pm
2. 127 pm
3. 80 pm
4. 108 pm
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An element with a molar mass of 2.7 × 10-2 kg mol-1 and density 2.7 × 103 kg m-3 forms a unit cell with an edge length of 405 pm. The type of unit cell is-
1. Simple cubic cell.
2. Face-centered cubic cell.
3. Body-centered cubic cell.
4. None of the above.
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