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Match the crystal system (Column I) with its axial parameter relations (Column II) and the Bravais lattice types it supports (Column III). Which of the following is the only correct match? Column I: (A) Hexagonal, (B) Orthorhombic, (C) Monoclinic, (D) Triclinic Column II: (P) a = b != c, (Q) a = b != c, (R) alpha = beta != gamma, (S) alpha != beta != gamma Column III: (I) Primitive, (II) Body-centred, (III) Face-centred, (IV) End-centred

1. A, Q, II
2. C, R, II
3. D, S, II
4. A, P, I

Correct answer: A, P, I

Solution

Hexagonal crystal system has a = b != c (Column P) and supports only the Primitive Bravais lattice (Column I), making option D (A, P, I) the correct match.

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