solid state

In which pair most efficient packing is present?

• bcc and simple cubic cell

• bcc and ccp

• hcp and ccp

• hcp and bcc

What is the effect of Frenkel defect on the density of ionic solids?

• The density of the crystal increases

• There is no relationship between density of a crystal and defect present in it

• The density of the crystal remains unchanged

• The density of the crystal decreases

Which of the following statements about amorphous solids is incorrect ?

• They melt over a range of temperature

• They are anisotropic

• There is no orderly arrangement of particles

• They are rigid and incompressible

Which of the following is not a crystalline solid?

• Rhombic S

• CsCl

• Glass

• KCl

The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol^-1 will be

• 9.3 2 g cm^-3

• 10 g cm^-3

• 14.2 g cm^-3

• 6.15 g cm^-3

Which of the following crystals does not exhibit Frenkel defect?

• AgBr

• AgBr

• KBr

• ZnS

The number of atoms per unit cell of bcc structure is

• 1

• 2

• 5

• 6

Solid CH4 is

• Ionic solid

• Molecular solid

• covalent solid

• does not exist

The coordination number of atoms in a cubic closed-packed is ________.

• 2

• 8

• 6

• 12

The coordination number of atoms in a body-centred cubic structure is _______

• 4

• 8

• 6

• 2