Density Packing Fraction
High-Yield Trend
Questions 11 MCQs
The fraction of total volume occupied by the atoms present in a simple cube is:
1.
2.
3.
4.
If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal is:
1. 1.81 Å
2. 2.10 Å
3. 2.92 Å
4. 1.27 Å
| 1. | The fraction of the total volume occupied by die atoms in a primitive cell is 0.48 |
| 2. | Molecular solids are generally volatile |
| 3. | The number of carbon atoms in a unit cell of a diamond is 8 |
| 4. | The number of Bravais lattices in which a crystal can be categorized is 14 |
1. 30%
2. 32%
3. 34%
4. 28%
AB crystallizes in a body-centered cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is:
1. 335 pm
2. 250 pm
3. 200 pm
4. 300 pm
A metal crystallizes with a fcc lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is:
1. 288 pm
2. 408 pm
3. 144 pm
4. 204 pm
2. 27 g mol–1
3. 20 g mol–1
4. 40 g mol–1
Iron exhibits bcc structure at room temperature. Above 900 °C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 °C is:
(Molar mass and atomic radii of iron remain constant with temperature)
1.
2.
3.
4.
1. 65 u
2. 63.1 u
3. 31.55 u
4. 60 u
1. 2
2. 5
3. 4
4. 3