A unit cell has A2+ ions at all the corners and body centre of the cube. Then a possible arrangement of anions
A. B- at all face centres
B. B2- at all face centres
C. B- at four face centres and B2- at two face centres
D. B2- at four face centres and B- at two face centres
E. B3- at four face centres
Total charge = 0 or total pos. charge = total neg. charge.
+2 x 2 = +4
-4 is possible in option C.