CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6pm. Given that the atomic mass of Cs= 133 μ and that of Br= 80μ and Avagadro number being 6.02x1023 mol-1, the density of CsBr is
42.5 g/cm3
0.425g/cm3
8.25g/cm3
4.25g/cm3
Select the correct statement. In the gas equation pV= nRT
n is the number of molecules of a gas
v denotes volume of one mole of the gas
n moles of the gas have a volume V.
P is the pressure of the gas when only one mole of the gas is present.
A compound formed by elements A and B crystallises in the cubic structure, where A atoms are present at the corner of a cube and B atoms are present at the face centres. The formula of the compound is
A2B2
AB3
AB
A3B
The edge length of face centred unit cubic cell is 508pm. If the radius of the cation is 110pm, the radius of the anion is ,
288pm
398pm
144pm
618pm
The number of atoms contained in a fcc unit cell of a monoatomic substance is
1
2
4
6
Internal energy and pressure of a gas per unit volume are related as
P= 2/3 E
P= 3/2E
P=1/2 E
P= 2E
Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351pm, the atomic radius of the lithium will be,
240.8pm
151.8pm
75.5pm
300.5pm
At 25oC and 730 mm pressure, 380mL of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occypy at 760mm pressure?
365mL
2g
10g
20g
If 'a' stands for the edge length of the cubic systems. simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively.
1/2 a: √3/4 a: 1/ 2√2 a
1/2 a: √3 a: 1/ √2 a
1/2 a: √3/2 a: √2/2 a
1a: √3a: √2 a
The temperature of the gas is raised from 27oC to 927oC, the root mean square velocity is
times of the earlier value
same as before
halved
doubled
