1. | \( 1 \over 12\) | 2. | \( 1 \over 2\) |
3. | \( 1 \over 3\) | 4. | \( 1 \over 4\) |
1. | \(1.550 \times10^{24}\) | 2. | \(3.011 \times10^{25}\) |
3. | \(3.011 \times10^{24}\) | 4. | \(6.022 \times10^{24}\) |
The number of tetrahedral and octahedral voids in hexagonal primitive unit cell are respectively:
1. 2, 1
2. 12, 6
3. 8, 4
4. 6, 12
A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75 % of octahedral voids. The formula of the compound is:
1.
2.
3.
4.
The vacant space in the BCC lattice cell is:
1. 26%
2. 48%
3. 23%
4. 32%
The number of octahedral void(s) per atom present in a cubic close-packed structure is:
1. 1
2. 3
3. 2
4. 4
Structure of a mixed oxide is cubic close-packed (CCP). The cubic unit cell of mixed oxide is composed of oxide ions. One-fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is:
1. A2BO2
2. A2B3O4
3. AB2O2
4. ABO2
Copper crystallizes in a face-centered cubic lattice with a unit cell length of 361 pm. The radius of the copper atom is:
1. 128 pm
2. 157 pm
3. 181 pm
4. 108 pm
If 'a’ stands for the edge length of the cubic systems: simple cubic, body-centered cubic, and face-centered cubic, then the ratio of radii of the spheres in these systems will be respectively:
1.
2.
3.
4.
If NaCl is doped with 10-4mol% of SrCl2, the concentration of cation vacancies will be (NA= 6.02×1023mol-1):
1.
2.
3.
4.