Question

Number of space lattices present in triclinic system is:

• A. four
• B. three
• C. two
• D. one

Answer 1

The correct option is B three

A triclinic system is a crystal described by a vector of unequal length, as in orthorhombic system. Also, the angles between these vectors must all be different and may include ${90}^{\circ }$. It has the minimum symmetry of all lattices.

It has four space lattices:

In it, $a\ne b\ne c$ and $\alpha \ne \beta \ne \gamma ={90}^{\circ }$

It is seen in $K_{2}C{r}_2{O}_7,CuS{O}_4.5H_{2}O$ and $H_{3}B{O}_3$