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A compound is formed by X and Y elements...

A compound is formed by X and Y elements .atoms of Y (anions )from hep lattice .Atoms of X (cation ) are in some octahedral holes .The formula of the copounds is XY,.What is the function of octahedral holes unoccupied by X?

A

`1//2`

B

`2//3`

C

`3//4`

D

`1//5`

Text Solution

Verified by Experts

The correct Answer is:
B
`:.` Number of octahedral voids = Number of lattic point
`:.` Given formula is `XY_(3) ` means . Three octahedral voids are filled agains t each lattic point (pratical) .
`:.` 3 octahedral voids fill = part of `Y _(3)`
`:.` 1 octahedral voids fill `=(1)/(3)` part of `Y _(3)`
`:.` Unoccupied fraction of voids `= - 1- (1) /(3) =(2) /(3)`
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