Advertisements
Advertisements
प्रश्न
Which of the following statement is not true about the hexagonal close packing?
पर्याय
The coordination number is 12.
It has 74% packing efficiency.
Tetrahedral voids of the second layer are covered by the spheres of the third layer.
In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.
Advertisements
उत्तर
In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.
Explanation:
Hexagonal close packing can be arranged by two layers
A and B one over another which can be diagrammatically represented as
Here, we can see easily that 1st layer and 4th layer are not exactly aligned. Thus, statement (iv) is not correct while other statements (i), (ii) and (iii) are true.
APPEARS IN
संबंधित प्रश्न
A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?
A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rdof tetrahedral voids. What is the formula of the compound?
How many lattice points are there in one unit cell of the following lattice?
Face-centred cubic
Ferric oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.
Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.
- What is the length of the side of the unit cell?
- How many unit cells are there in 1.00 cm3 of aluminium?
The coordination number of AB having rock salt geometry is ____________.
Hexagonal close packed arrangement of ions is described as ____________.
The arrangement ABC ABC.... is referred to as ____________.
What is the coordination number in a square close packed structure in two dimensions?
The octane number of Iso-octane is
The crystal system of a compound with unit cell dimensions a = 0.387, b = 0.387 and c = 0.504 nm and α = β = 90° and ϒ = 120° is
A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?
Co-ordination number of sodium ion Na+ in Nacl is:-
Which of the following is frenkal effect.
The number of tetrahedral and octahedral voids in a CCP array of 100 atoms are respectively:
The right option for the number of tetrahedral and octahedral voids in the hexagonal primitive unit cell is ______.
The right options for the number of tetrahedral and octahedral voids in the hexagonal primitive unit cells is ______.
The right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell is ______.
