Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
In hexagonal close packing (hcp), the quantity of octahedral voids is equivalent to the number of constituent particles.
Fe3+ ions occupy two thirds of the octahedral voids in ferric oxide, while O2+ ions form the cubic close-packed structure. If there are nO2−ions in the unit cell, the quantity of Fe3+ ions per unit cell would be `(2 n)/3`.
Hence, formula of ferric oxide = `((2 n)/3)` Fe3+ . (n) O2−
= Fe2nO3n
= Fe2O3
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
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 ____________.
In NaCl structure ____________.
How can you best describe the elongated octahedral structure of blue vitriol, CuSO4.5H2O?
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
The packing efficiency of the two dimensional square unit cell shown below is:
Which of the following is frenkal effect.
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 ______.
Element 'B' forms ccp structures and A occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is ______.
The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in AxB. The value of x is ______. (Integer answer)
The density of a pure substance 'X' whose atoms pack in cubic close pack arrangement is 1 g/cc. If all tetrahedral voids are occupied by 'Y' atoms. The value of '3a' is ______ g/cc, if the density of resulting solid is 'a' g/cc.
[Given: Atomic mass (X) = 30 g/mol, (Y) = 20 g/mol]
