The Solid State

The vacant space in bcc lattice cell is 

• 26%

• 48%

• 23%

• 23%

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y^-) will be 

• 275.1 pm

• 322.5 pm

• 241.5 pm

• 241.5 pm

AB crystallises in a body centred cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositely charged ion in the lattice is

• 335 pm

• 250 pm

• 200 pm

• 200 pm

Copper crystallises in a face-centered cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm?

• 128

• 157

• 181

• 108

Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell lithium is 351 pm, the atomic radius of the lithium will be 

• 240.8 pm

• 151.8 pm

• 75.5

• 75.5

Volume occipied by one molecule of water (density = 1 g cm^-3) is

• 9.0 x 10^-23

• 6.023 x 10^-23 cm³

• 3.0 x 10^-23 cm³

• 3.0 x 10^-23 cm³

Which of the following statements is not correct? 

• The fraction of the total volume occupied by the atoms in a primitive cell is 0.48

• molecules solids are generally volatile

• the number of carbon atoms in a unit cell

• the number of carbon atoms in a unit cell

If 'a' stands for the edge length of the cubic system:simple cubic , body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be repsectively,

Percentage of free space in a body centred cubic unit cell is 

• 30%

• 32%

• 34%

• 34%

With which one of the following elements silicon should be doped so as to give p - type of semiconductor?

• Germanium

• Arsenic

• Selenium 

• Selenium