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A compound is formed by cation C and ani...

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is

A

`C_(4)A_(3)`

B

`C_(2)A_(3)`

C

`C_(3)A_(2)`

D

`C_(3)A_(4)`

Text Solution

Verified by Experts

The correct Answer is:
D
Number of atom per unit cell in `hcp=6`
number of octahedral void in `hcp=6`
Number of anions per unit cell `=6`
cation occupy 75% of octahedral void `=6xx(75)/(100)=(9)/(2)`
`C:A`
`9//2:6`
`9:12`
`3:4`
Formula of compound `=C_(3)A_(4)`
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