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Ferrous oxide has a cubic structure and each edge of the unit cell is

50 Å  . Assuming density of the oxide as 4.0g – cm -3     then the number of  Fe2+   and  O2-  ions present in each unit cell will be

a. Four Fe2+ and four O2-

b. Two  Fe2+  and four O2-

c.  Four Fe2+    and  O2-

d.Three Fe2+   and three  O2-

Ans. a

 

(9)

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