Ferric oxide crystallizes in a hexagonal close pakced array of oxide ions with two out of every three octahedral holes occupied by ferric ions. Derive the formula of the ferric oxide.

Grerric oxide crystalises 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 a ferric oxide.

If the unit cell of a mineral has cubic close packed array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are

In a solid, oxide ions are aranged in ccp. One sixth of the tetrahedral voids and occupied by the cations A and one third of the octahedral voids and occupied by the cations B. what is the formula of the compound?

In a cubic close packed structure of mixed oxides, the lattice is made up of oxide ions, one eigth of the tetrahedral voids are occupied by divalent ions (A^(2+)) while one half of octrahedral voids are occupied by trivalent ions (B^(3+)) . What is the formula of the oxide?

A spinel is an important class of oxide consisting two types of metal ions withs the oxide ions arranged in ccp layers . The normal spinel has one -eight of the tetrahendral holes occupied by one type of metal ions and one- half of the octaherdral holes occupied by another type of metal ion. Such a spine is formed by Mg^(2+), Al^(3+) and O^(2-) . The netutrality of the crystal is benig maintained. Type of hole occupied by Al^(3+) ions is:

Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

A spinel is an important class of oxide consisting two types of metal ions with the oxide ions arranged in ccp layers . The normal spinel has one -eight of the tetrahedral holes occupied by one type of metal ions and one- half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by Mg^(2+), Al^(3+) and O^(2-) . The neutrality of the crystal is being maintained. The formula of the spinel is :

In the spinel structur, oxides ions are cubical-closet packed whereas 1/8th of tetrahedral voids are occupied by A^(2+) cation and 1/2 of octahedral voids are occupied by B^(+) cations. The general formula of the compound having spinel structure is:

In corrundum, oxide ions are arranged in hcp arrangement and the aluminium ions occupy 2/3 of the octahedral voids. What is the formula of corrudum?