Question

Tetragonal crystal system has which of the following unit cell dimensions:

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

Answer 1

The correct option is D $a=b\ne c$ and $\alpha =\beta =\gamma ={90}^{\circ }$

Tetragonal system has the unit cell dimension $a=b\ne c,\alpha =\beta =\gamma ={90}^{\circ }$


Examples include:
$WhiteSn,Sn{O}_2,Ti{O}_2,CaS{O}_4$