Question

Which of the following statement(s) is/are true regarding monoclinic crystal system?

• A. All the 3 edge lengths are different
• B. Two of the edge lengths are same
• C. Two of the axis angles are equal to ${120}^o$
• D. All the axial angles are different

Answer 1

The correct option is A All the 3 edge lengths are different

For a monoclinic crystal system, all the edges are of different length.
$a\ne b\ne c$

Two of the axial angles are equal to ${90}^o$ and the third axial angle is not equal to ${90}^o$.
$\alpha =\gamma ={90}^o;\beta \ne {90}^o$


Monoclinic sulphur and $N{a}_{2}S{O}_4.10H_{2}O$ are examples of monoclinic crystal system.
Thus, option is true for monoclinic crystal system.