1.

A salt MX has NaCl type lattice in which r is the minimum distance between M^(z+) and X^(z-). Each M^(z+) ion is surrounded by

Answer»

`6X^(Z-)`ions each at a DISTANCE `r`
`12M^(z+)` ions, each at a distance `sqrt(2)r`
`8oX^(z-)` ions, each at a distance `sqrt(3)r`.
`12M^(z+)` ions, each at a distance `sqrt(4)r`.

SOLUTION :Crystal is FCC


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