A) \[\alpha =b=c,\alpha =\beta =90{}^\circ =\gamma \]
B) \[\alpha =\beta =\gamma =90{}^\circ ,\text{ }\alpha =b\ne c\]
C) \[\alpha =\beta =\gamma =90{}^\circ ,\text{ }a\ne b\ne c\]
D) \[\alpha =\beta =90{}^\circ ,\text{ }\gamma =120{}^\circ ,\text{ }a=b\ne c\]
Correct Answer: B
Solution :
[b] \[\alpha =\beta =\gamma =90{}^\circ ,a=b\ne c\] In \[(a)\,a=b=c,\,a=P=90{}^\circ =y\] cubic structure In [c] \[\alpha =\beta =\gamma =90{}^\circ ,a\ne b\ne c\] orthorhombic or rhombic structure In [d] \[\alpha =\beta =90{}^\circ ,\text{ }\gamma =120{}^\circ ,\text{ }a=b\ne c\]hexagonal structure
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