solid state

Number of atoms in a body centered unit cell

• 1

• 2

• 3

• 4

The coordination number of a metal crystallising in a hexagonal close packing

• 12

• 4

• 8

• 6

Diamond is an example of (a)   solid

Crystal system characterized by a ≠ b≠ c and α = β = γ = 90^o

• Hexagonal

• Ortho rhombic

• Tetragonal

• Triclinic

Smallest repeating unit of crystal lattice

• Lattice site

• Unit cell

• Crystal lattice

• Lattice point

Crystal showing both Schottky & Frenkel defect

• AgBr

• ZnO

• AgI

• NaCl

Anionic sites occupied by unpaired electrons are called

• F Centres

• Interstitial Centres

• Cationic Centres

• Anionic Centres

The packing efficiency in simple, fcc, bcc unit cells will be respectively

• 74% 52.4% 68%

• 52.4% 68% 74%

• 68% 74% 52.4%

• 52.4% 74% 68%

The total number of tetrahedral voids and octahedral voids in a given cubic unit cell with N number of atoms will be respectively

• 2N and N

• N and 2N

• 4N and N

• N and 4N

Analysis shows that FeO has a non-stoichiometric composition with formula Fe_0·95O. Give reason.

• Schottky defect

• Frenkel defect

• Metal excess defect

• Metal deficiency defect