A) Cubic
B) Hexagonal
C) Orthorhombic
D) Rhombohedral
Correct Answer: B
Solution :
Because \[\operatorname{a}=b\ne c\,\,and\,\,\alpha =\beta =90{}^\circ , \lambda =120{}^\circ \] for cubic, \[\operatorname{a}=b=c,\text{ }\alpha =\beta =\lambda =90{}^\circ \] For orthorhombic, \[\operatorname{a}\ne b\ne c,\text{ }\alpha =\beta =\lambda =90{}^\circ \] For rhombohedral \[\operatorname{a}=b=c,\text{ }\alpha =\beta =\lambda =90{}^\circ \] These are axial lengths and angles.
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