Chemistry - Solid State Question with Solution | TestHub

(A) $\to$ P, Q, R, S: Monoclinic (P), Cubic/Diamond (Q), Orthorhombic (R), and Tetragonal (S) all have at least two interfacial angles equal to $90^{\circ }$ ($\alpha =\gamma =90^{\circ }$ or $\alpha =\beta =\gamma =90^{\circ }$).

(B) $\to$ Q, S: Diamond ($a=b=c$) and Tetragonal ($a=b\ne c$) have at least two equal axial lengths.

(C) $\to$ P, R, T: Monoclinic (P), Orthorhombic (R), and Triclinic (T) all have completely unequal axial lengths ($a\ne b\ne c$).

(D) $\to$ T: The Triclinic system is completely unsymmetrical, meaning none of its angles are equal ($\alpha \ne \beta \ne \gamma \ne 90^{\circ }$).