Voids in crystal lattice

The distance between an octahedral and a tetrahedral void in $\mathrm{pm}$ in FCC lattice would be: 

(Consider edge length is $7 \mathrm{pm}$)

A molecule have radius ratio of $\left(\frac{{\mathrm{r}}^{-}}{{\mathrm{r}}^{+}}\right)$ is more than 0.732. Which of the following void is presented in the molecule.

A molecule have radius ratio of $\left(\frac{{\mathrm{r}}^{-}}{{\mathrm{r}}^{+}}\right)$ is 0.200 . Which of the following void is presented in the molecule.

The radius ratio of triangular planar radius is $\left(\frac{{\mathrm{r}}^{+}}{{\mathrm{r}}^{-}}=\right)$

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:

In a compound, atoms of element $\mathrm{Y}$ form cubic close packing lattice and those of element $\mathrm{X}$ occupy$\frac{2}{3} \mathrm{times}$  of tetrahedral voids. The formula of the compound will be

A solid compound $\mathrm{XY}$ has $\mathrm{NaCl}$ structure. If the radius of the cation is $100 \mathrm{pm}$, the radius of the anion $\left({\mathrm{Y}}^{-}\right)$ in pm will be

(Round of the answer up to four significant figures)

The total number of tetrahedral voids in the face centred unit cell is

In a carbon allotrope having $\mathrm{FCC}$ lattice, two atoms are at $\left(0, 0, 0\right)$ and $\left(\frac{\mathrm{a}}{8}, \frac{\mathrm{a}}{8}, \frac{\mathrm{a}}{8}\right)$ coordinates. What is the ratio of $\mathrm{C}-\mathrm{C}$ bond length distance to the edge length of the unit cell?

In ${\mathrm{CaF}}_2$ crystal, ${\mathrm{Ca}}^{2+}$ions are present in fcc arrangement, calculate the number of ${\mathrm{F}}^{-}$ ions in the unit cell.

 In a compound, oxide ions are arranged in cubic close packing arrangement. Cations $\mathrm{A}$ occupy $1/6$ of the tetrahedral voids and cations $\mathrm{B}$ occupy $1/3$ of the octahedral voids. The formula of the compound is
 

For the structure given below the site marked as S is a :-

The radius of ${\mathrm{Ag}}^{+}$ ion is $126 \mathrm{pm}$ and ${\mathrm{I}}^{-}$ ion is $216 \mathrm{pm}$. The co-ordination number of ${\mathrm{Ag}}^{+}$ ion is:-

Which type of structure does $\mathrm{RbCl}$ have if ionic radii of ${\mathrm{Rb}}^{\oplus }$ and ${\mathrm{I}}^{\Theta }$ respectively are $1.46 \stackrel{°}{\mathrm{A}}$ and $2.16 \stackrel{°}{\mathrm{A}}$:-

An ionic compound is expected to have a tetrahedral structure if ${\mathrm{r}}_{+}/{\mathrm{r}}_{-}$ lies in the range of

The total number of tetrahedral voids in the face-centred unit cell is _____.

The positions of ${\mathrm{C}}^{-}$ ions in $\mathrm{NaCl}$ structure are:

In a solid $\text{'}\mathrm{AB}\text{'}$ having the $\mathrm{NaCl}$ structure, $\text{'}\mathrm{A}\text{'}$ atoms occupy the every $\mathrm{CCP}$ and $\mathrm{B}$ atoms are in $\mathrm{OHV}$. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is-
 

The edge length of face centred cubic unit cell having rock salt structure is $508 \mathrm{pm}$. If the radius of the cation is $110\mathrm{pm},$ the radius of the anion is-