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प्रश्न
Which of the following lattices has the highest packing efficiency (i) simple cubic (ii) body-centred cubic and (iii) hexagonal close-packed lattice?
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उत्तर १
Hexagonal close-packed lattice has the highest packing efficiency of 74%. The packing efficiencies of simple cubic and body-centred cubic lattices are 52.4% and 68% respectively.
उत्तर २
Packing efficiency of:-
Simple cubic = 52.4% bcc = 68% hcp = 74%
hcp lattice has the highest packing efficiency
संबंधित प्रश्न
Describe triclinic crystal lattice with the help of a diagram.
How will you distinguish between the following pair of terms?
Crystal lattice and unit cell
Give the significance of a ‘lattice point’.
Name the parameters that characterize a unit cell.
What is meant by the term ‘coordination number’?
An ionic crystal lattice has limiting value of radius ratio as 0.414 to 0.732; the co-ordination number of its cation is _______.
(A) 6
(B) 4
(C) 3
(D) 12
Which of the following parameters are correct for triclinic lattice?
(A) α = β = γ = 90° and a = b = c
(B) α ≠ β ≠ γ = 90° and a ≠ b ≠ c
(C) α = γ = 90°, β ≠ 90° and a ≠ b ≠ c
(D) α ≠ β ≠ γ ≠ 90° and a ≠ b ≠ c
Calculate the number of atoms present in 2 gram of crystal which has face-centred cubic
(FCC) crystal lattice having edge length of 100 pm and density 10 gcm−3
For a crystal of sodium chloride, state the type of lattice in which it crystallises.
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Complete the following statement by selecting the correct alternative from the choices given:
In a face-centered cubic lattice, atom (A) occupies the comer positions and atom (B) occupies the face centre positions. If one atom of (B) is missing from one of the face-centered points, the formula of the compound is:
The yellow colour in NaCl crystal is due to ____________.
Why ionic crystals are hard and brittle?
The lattice site in a pure crystal cannot be occupied by ______.
AB crystallises in a body centred cubic lattice with edge length' a' equal to 387 pm The distance between two oppositely charged ions in the lattice is:
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