A) \[a=b=c,\,\,\alpha =\beta =\gamma =90{}^\circ \]
B) \[a\ne b=c,\,\,\alpha \ne \beta =\gamma =90{}^\circ \]
C) \[a\ne b\ne c,\,\,\alpha \ne \beta \ne \gamma =90{}^\circ \]
D) \[a\ne b\ne c,\,\,\alpha =\beta =\gamma \ne 90{}^\circ \]
Correct Answer: C
Solution :
In triclinic system, the crystal is described by vectors of unequal length, as in the orthorhombic system. Triclinic crystal is a highly dissymmetric crystal having \[a\ne b\ne c,\,\,\alpha \ne \beta \ne \gamma \,90\].
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