Question

Which parameters are correct for unit cell of $N{a}_{2}S{O}_4,10H_{2}O$ crystal?

• A. $a\ne b\ne c$ and $\alpha =\gamma ={90}^o,\beta \ne {120}^o$
• B. $a=b=c$ and $\alpha =\beta =\gamma ={90}^o$
• C. $a=b\ne c$ and $\alpha =\beta =\gamma ={90}^o$
• D. $a\ne b\ne c$ and $\alpha \ne \beta \ne \gamma ={90}^o$

Answer 1

The correct option is A $a\ne b\ne c$ and $\alpha =\gamma ={90}^o,\beta \ne {120}^o$

$Na,S{O}_4,H_{2}O$ belongs to monoclinic sulphade as for molecule.

Axial length:$a\ne b\ne c$

Axial angle: $\alpha =\gamma ={90}^o,\beta \ne {120}^o$