A)
Crystal system
Axial distance
Axial angles
Examples
Cubic
\[a\ne ~b=c\]
\[\alpha =\beta \ne \gamma =90{}^\circ \]
\[Cu,\text{ }KCl\]
B)
Crystal system
Axial distance
Axial angles
Examples
Monoclinic
\[a\ne ~b=c\]
\[\alpha =\beta =\gamma =90{}^\circ \]
\[PbCr{{O}_{2}},PbCr{{O}_{4}}\]
C)
Crystal system
Axial distance
Axial angles
Examples
Rhombohedral
\[a=~b=c\]
\[\alpha =\beta =\gamma \ne 90{}^\circ \]
\[CaC{{O}_{3}},\text{ }HgS\]
D)
Crystal system
Axial distance
Axial angles
Examples
Triclinic
\[a=~b=c\]
\[\alpha \ne \beta =\gamma \ne 90{}^\circ \]
\[{{K}_{2}}C{{r}_{2}}{{O}_{7}},\text{ }CuS{{O}_{4}}.\text{ }5{{H}_{2}}O\]
Correct Answer: C
Solution :
Rhombohedral crystal system \[a=b=c\], \[\alpha =\beta =\gamma \ne {{90}^{o}}\] ex ? \[NaN{{O}_{3}}\], \[CaS{{O}_{4}}\], calcite \[CaC{{O}_{3}}\], \[HgS\]
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