SOLID STATE

The number of nearest particles which is in direct contact with a particle in a closed packed structure

• Unit Cell

• Void

• Packing efficiency

• Coordination number

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

The crystal structure of sodium chloride is

• BCC
• FCC
• amorphous
• covalent

The number of nearest particles which is in direct contact with a particle in a closed packed structure

• Unit Cell

• Void

• Packing efficiency

• Coordination number

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

• Hexagonal

• Ortho rhombic

• Tetragonal

• Triclinic

If a crystal lattice of a compound, each corner of a cube is enjoyed by sodium, each edge centre of a cube has oxygen and centre of a cube is enjoyed b tungsten (W), then give its formula

• Na₂WO₄

• NaWO₃

• Na₃WO₃

• Na₂WO₃

Structure of a mixed oxide is cubic close-packed (c.c.p). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

• ABO₂

• A₂BO₂

• A₂B3O₄

• AB₂O₂

In a face centred cubic arrangement off A and B atoms whose A atoms are at the corner of the unit cell and B atoms at the face centres. One of the A atom is missing from one corner in unit cell. The simplest formula of compound is

• A₇B₃

• AB₃

• A₇B₂₄

• A_7/8B₃

The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

• 144

• 288

• 396

• 408