Question

Which crystal system of the unit cell has dimensions as : $a\ne b\ne c\text{and}\alpha \ne \beta \ne \gamma \ne {90}^o$?

• A. Monoclinic
• B. Triclinic
• C. Orthorhombic
• D. Rhombohedral

Answer 1

The correct option is B Triclinic

The axial distances and the axial angles, $a\ne b\ne c\text{and}\alpha \ne \beta \ne \gamma \ne {90}^o$ represents triclinic system. It is the most unsysmmetrical crystal system.
In this crystal system, none of the edge legths is equal and none of the angles is equal to each other. Also, none of the angle is equal to ${90}^o.$


Examples of triclinic crystal systems include $K_{2}C{r}_2{O}_7$ and $H_{3}B{O}_3.$
Hence, the correct option is C.