Edge length of a cube is 300 pm . Its body diagonal would be

In a face centred cubic arrangement of $A$ and $B$ atoms in which ' $A$ ' atoms are at the corners of the unit cell and ' $B$ ' atoms are at the face centres. One of the ' $A$ ' atoms is missing from one corner in unit cell.The simplest formula of compounds is

The correct statement regarding defect in solids is

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