1.

A certain solid mixed oxide crystallising in the cubic system contains cations M_(1) and M_(2) and the oxide ion O^(2-) Each M_(1) ion is surrounded by 12 equidistant nearest neighbour oxide ions. If the oxide ions occupy face centers of the cubic unit cell, where are the M_(2) ions situated ?

Answer»

At the center of the until cell
At the CORNERS of the cube
At the edge centers
Occupying half the number of edge centers 

Solution :`M_(1)` is situated at the corners then `O^(-2)` ions at the face CENTRES then C.N of `M_(1)` 12 EQUIDISTANCE neighbour oxide ions.


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