Solid state 1 (CBSE)

A metal crystallizes in a body-centered cubic structure. If 'a' is the edge length of its unit cell, 'r' is the radius of the sphere. What is the relationship between 'r' and 'a'?

• None of these

If the radius of octaherdral voids is 'r' and radius of the atoms in close packing is 'R'. What is the relation between 'r' and 'R'?

• r = 0.2010R

• r = 3.010R

• r = 0.414R

• r = 4.14R

Arrange simple cubic, body centered cubic (bcc), face centered cubic (fcc) and hexagonal close packing (hcp) in increasing order of packing efficiency.

• hcp > fcc = bcc > simple cubic

• fcc > bcc > simple cubic > hcp

• hcp = fcc > bcc > simple cubic

• hcp > fcc > bcc > simple cubic

What is the coordination number of atoms in cubic close packed structure?

• 4

• 6

• 8

• 12

Pick out odd one from the following options.

• Sulphur

• Argon

• Diamond

• Solid CO₂

Solid A is very hard electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

• Metallic solid

• Ionic solid

• Covalent solid

• Molecular solid

What is the total number of atoms per unit cell in a face centered cubic structure?

• 1

• 2

• 3

• 4

An ionic compound AB₂ possesses CaF₂ type crystal structure. Write the coordination numbers of A²⁺ and B^- ions in crystals of AB₂.

• C.N. of A²⁺ = 2

  C.N. of B^- = 1

• C.N. of A²⁺ = 4

  C.N. of B^- = 2

• C.N. of A²⁺ = 8

  C.N. of B^- = 4

• C.N. of A²⁺ = 4

  C.N. of B^- = 8

If three elements X, Y, and Z crystallize in a cubic solid with X atoms at the corners, Y atoms at the cube centers, and Z atoms at the faces of the cube, then what will be the formula of the compound?

• XYZ

• XYZ₂

• XYZ₃

• XYZ₄

A metal having atomic mass 50 g/mol has a body centered cubic crystal structure. The density of metal is 5.96 g/cm³. Find the volume of the unit cell.

• 2.86×10^-24 cm³

• 7.86×10^-24 cm³

• 27.86×10^-24 cm³

• 26×10^-24 cm³