Question

The most unsymmetrical system is:

• A. cubic
• B. hexagonal
• C. triclinic
• D. orthorhombic

Answer 1

The correct option is C triclinic

SYSTEM SIDES ANGLES
Cubic $a=b=c$ $\alpha =\beta =\gamma$
Hexagonal $a=b\ne c$ $\alpha =\beta ={90}^o;\gamma ={120}^o$
Triclinic $a\ne b\ne c$ $\alpha \ne \beta \ne \gamma$
Orthorhombic $a\ne b\ne c$ $\alpha =\beta =\gamma$

Hence, the most unsymmetrical system is triclinic.

Note: (The lattice systems can be characterized by their shapes according to the relative lengths of the cell edges (a, b, c) and the angles between them ($\alpha ,\beta ,\gamma$)) .

Option C is correct.