Home
Class 12
CHEMISTRY
In sapphire, oxide ions are arranged in ...

In sapphire, oxide ions are arranged in hexagonal close packing and aluminium ions occupy two-thirds of the octahedral voids. What is the formula of sapphire?

Text Solution

Verified by Experts

The correct Answer is:
`Al_(2)O_(3)`
Let number of anion `O^(2-) = 1//"atom"`
Number of `TV = 2// "atom"`
Number of `OV = 1//"atom"`
Number of cation `(Al^(3+)) = (2)/(3) xx 1 = (2)/(3)`
Formula: `Al^(3+)_(2//3)O^(2-)` or `Al_(2)O_(3)`.
Promotional Banner

Similar Questions

Explore conceptually related problems

In corundum, oxide ions are arranged in hcp arrangement and the aluminium ions occupy two-third of the octahedral holes. Its formula is :

In a crystallizes solid, anions B are arranged in cubic close packing, cations A are equally distributed between octahedral and tetrahedral voids, what is the formula of the solid?

A solid is formed by two elements P and Q. The element Q forms cubic close packing and atoms of P occupy two-third of tetrahedral voids. The formula of the compound is

A compound is formed by two elements x and y. Atoms of the elements y make ccp (cubic close packing) and those of the element x occupy all the octahedral voids. What is the formula of the compound ?

A solid A^+ B^- has the B^- ions arranged as below. If the A^+ ions occupy half of the octahedral sites in the structure. The formula of solid is

A compund is made of two elements P and Q are in ccp arrangement while atoms P occupy all the tetrahedral voids. What is the formula of the compound?

A compound is formed by two elements x and y. Atoms of the element y (as anions) make ccp and those of the element x (as cations) occupy all the octahedral voids what is the formula of the compound?

In an LiI crystal, I^(ɵ) ions from a cubical close-packed arrangement, a nd Li^(o+) ion occupy octahedral holes. What is the relationship between the edge length of the unit cells and radii of the I^(ɵ) ions if a = 60 "pm".

A solid is made up of two elements P and Q. P atoms are in ccp arrangement while atoms Q occupy all the octahedral voids and half of the tetrahedral voids. The formula of the compound is :