The anions (A) form hexagonal closest packing and atoms ( C) occupy only 2/3 of octahedral voids in it, then the general formula of the compound is

Options

A. CA
B. `A_(2)`
C. `C_(2)A_(3)`
D. `C_(3)A_(2)`

Answer

C

Explanation

Hexagonal close packing contains 6 atoms per unit cell and hence the number of octahedral voids per unit cell is 6. Hence, number of A atoms per unit cell = 6
and number of atoms per unit cell = `6xx2/3=4`
The formula of ionic compound is given as simplest formula and hence formula is `C_(2)A_(3)`.