A) \[a=b=c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\]
B) \[a=b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\]
C) \[a\ne b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\]
D) \[a=b\ne c\] and \[\alpha =\beta ={{90}^{o}},\,\,\,\gamma ={{120}^{o}}\]
Correct Answer: B
Solution :
Tetragonal system has the unit cell dimension \[a=b\ne c,\,\alpha =\beta =\gamma =90{}^\circ \].
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