Solid State · Question 13

The ionic radii of A+ and B- ions are 0.98 10-10 m and 1.81 10-10 m. The coordination number of each ion in AB is

1. 8
2. 2
3. 6
4. 4

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion ( Ca2+) and fluoride ion (F-) are

1. 4 and 2
2. 6 and 6
3. 8 and 4
4. 4 and 8

The vacant space in bcc lattice unit cell is

1. 48%
2. 23%
3. 32%
4. 26%

The correct statement regarding defects in crystalline solids is

1. Frenkel defects decrease the density of crystalline solids
2. Frenkel defect is a dislocation defect
3. Frenkel defect is found in halides of alkali metals
4. Schottky defects have no effect on the density of crystalline solids

A given metal crystallises out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?

1. 80 pm
2. 108 pm
3. 40 pm
4. 127 pm

If a is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be

1. 2 3a
2. 4 3a
3. 34a
4. 32a

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm-3. The molar mass of the metal is (NA Avogadro's constant = 6.02 1023 mol-1)

1. 27 g mol-1
2. 20 g mol-1
3. 40 g mol-1
4. 30 g mol-1

The number of carbon atoms per unit cell of diamond unit cell is

1. 6
2. 1
3. 4
4. 8

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. ABO2
2. A2BO2
3. A2B3O4
4. AB2O2

A metal crystallises with a face-centred cubic 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