The edge length of fcc unit cell of NaCl is 508 pm.
If the radius of cation is 110 pm then radius of the anion is :
1. 244 pm
2. 144 pm
3. 288 pm
4. 398 pm
A compound that shows Schottky as well as Frenkel defect among the following is -
1. ZnS
2. AgBr
3. NaCl
4. AgCl
The formula of nickel oxide with metal deficiency defect in its crystal is . The crystal contains ions. The fraction of nickel existing as ions in the crystal is-
1. 0.96
2. 0.04
3. 0.50
4. 0.31
In the spinel structrue, oxides ions are cubical-closest packed whereas 1/8th of tetrahedral voids are occupied by cation and 1/2 of octahedral voids are occupied by cations. The general formula of the compound having spinel structure is :
1.
2.
3.
4.
An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centers of the faces of the cube. The empirical formula for this compound would be :
1. AB
2. A2B
3. AB3
4. A3B
An element crystallizes in a structure having FCC unit cell of an edge length 200 pm. If
200 g this element contains 24 x 1023 atoms, the density of the element is
1. 50.3 g/cc
2. 63.4 g/cc
3. 41.6 g/cc
4. 34.8 g/cc
Ionic radii of Mg2+ and O2- ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of Mg2+ ion respectively are
1. Tetrahedral, 12
2. Octahedral, 6
3. Tetrahedral, 6
4. Octahedral, 8
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.
CsBr crystallises in a body-centered cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 amu and that of Br = 80 amu and the Avogadro number being 6.02×1023 mol-1, the density of CsBr is:
1. 42.5
2. 0.425
3. 8.25
4. 4.25
For a cubic crystal structure, which one of the following relations indicating the cell characteristic is correct?
1.
2.
3.
4.