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The number of planes of symmetry in a hexagonal unit cell is

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Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
A metallic element has a cubic lattice. Each edge of the unit cell is2A°'. The density of the metal is 2.5g cm-3. The unit cell in 200g of the metal are
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Polonium (atomic mass =209) crystallises in a simple cubic structure with a density of 9.32 g cm-3. Its lattice parameter (in pm) is closest to
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

What is the number of atoms in end centered unit cell?

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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Which type of crystal system has axial angles α=β=γ=90° ?
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
NaCl is a FCC lattice where Na+ ions are at corner and face centre positions. Chloride ions are at edge centres and body centre positions. How many NaCl formula units will be in an unit cell
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Define Unit cell and Paramagnetic substance.
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

(a) Aluminium crystallizes in a cubic close-packed structure. Its metallic radius is 125 pm. What is the length of the side of the unit cell?

(b) Why is potassium chloride sometimes violet instead of pure white?

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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
How will you distinguish between the following pair of term?
Hexagonal close-packing and cubic close packing?
 
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is:
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
The FCC-crystal contains how many atoms in each unit cell?
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Which of the following is an example for orthorhombic crystal?
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
In a face centered cubic lattice atoms A are at the corner points and atoms B at the face centered points. If atom B is missing from one of the face centered points, the formula of the ionic compound is :
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Which of the following lattices has the highest packing efficiency? (assuming that atoms are touching each other).
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
How many Bravais lattices are possible in a crystal?
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Differentiate between primitive unit cell and centred unit cell.
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
For a body-centered cubic structure with unit cell edge length of $a$, the radius of the sphere of each atom is
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
Atoms of an element A form an fcc lattice, while those of element B occupy half of the octahedral holes. The chemical formula for the compound formed by the elements A and B is
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
A match box exhibits
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Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

The cubic unit cell structure of a compound containing cation M and anion X is shown below. When compared to the anion, the cation has smaller ionic radius. Choose the correct statement(s).

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HARD
Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices
If the angle of incidence of X-ray of wavelength 3 Å which produces a second order diffracted beam from the 100 planes in a simple cubic lattice with interlayer spacing a=6 Å is 30o, the angle of incidence that produces a first - order diffracted beam from the 200 planes is