Ferrous oxide has cubes structure and each edge of the unit cell is `5.0 Å` .Assuming of the oxide as `4.0g//cm^(3)` then the number of `Fe^(2+) and O^(2)` inos present in each unit cell will be

Options

A. Two `Fe^(2+)` and four `O^(2-)`
B. Three `Fe^(2+)` and three `O^(2-)`
C. Four `Fe^(2+)` and two `O^(2-)`
D. Four `Fe^(2+)` and four `O^(2-)`

Answer

D