For an ionic crystal of the general formula $AX$ and coordination number $6$,the value of radius ratio will be

The number of octahedral voids in a $BCC$ structure is:

$A$ compound contains $Ca, Ti$ and $O$ elements. If $Ca^{2+}$ ions are at the corners of the cube,$Ti$ ions are at the body center,and $O^{2-}$ ions are at the face centers,then the molecular formula of the compound and the oxidation state of $Ti$ are respectively ........

$A^{+}B^{-}$ shows rock salt type arrangement. Edge length of unit cell is $6 \ \mathring{A}$. If radius of $A^{+}$ is $1 \ \mathring{A}$,then the incorrect option is:

What does the unit cell of $CsCl$ contain?

By increasing the pressure on $NaCl$ crystal,its coordination number will