Q 1412123939.     Ferrous oxide had a cubic structure and the edge of the unit cell is` 5 A^0.` If density of the oxide is `4`g/cc How many `Fe^(+2)` & `O^(-2)` ions are present in the unit cell ?
(At. wt. of `Fe = 56`)

A

`4Fe^(2+), 40^(-2)`

B

`2Fe^(2+), 40^(-2)`

C

`4Fe^(2+), 20^(-2)`

D

`3Fe^(2+), 30^(-2)`

HINT

Use formula: Density `= (n xx mol. wt)/(a^3xxAv.No .)`

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