Out of $7$ crystal systems,how many have face-centered unit cells?

Most crystals show good cleavage because their atoms,ions or molecules are

Among the following,the crystal system which includes end-centered is

Which of the following is true for a cubic crystal system?

Which of the following crystals has a unit cell such that $a \neq b \neq c$ and $\alpha \neq \beta \neq \gamma \neq 90^{\circ}$?

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