The number of octahedral sites per sphere in a $fcc$ structure is

If the pressure on a $NaCl$ structure is increased,then its coordination number will

If $AgI$ crystallises in zinc blende structure with $I^{-}$ ions at lattice points,what fraction of tetrahedral voids is occupied by $Ag^{+}$ ions? ............ $\%$

$A$ compound crystallizes in a $NaCl$ type structure. What is the percentage of unoccupied tetrahedral voids?

If $a$ is the length of the side of a cube,the distance between the body-centered atom and one corner atom in the cube will be

The structure of $TlCl$ is similar to $CsCl$. What is the coordination number of $Tl^{+}$?