Question

Match the crystal system/unit cells mentioned in Column I with their characteristic features mentioned in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 x 4 matrix given in the ORS. [2007]

Column I (A) Simple cubic and face-centered cubic parameters (B) cubic and rhombohedral (C) cubic and tetragonal (D) hexagonal and monoclinic

Column II (p) have these parameters, $a = b = c$ and $\alpha = \beta = \gamma$ (q) are two crystal systems (r) have only two crystallographic angles of $90^\circ$ (s) belong to same crystal system

• A. A - p
• B. B - q
• C. C - r
• D. D - s
• E. A - s
• F. B - p
• G. C - q
• H. D - r

Answer 1

Answer: (E), (F), (G), (H)

(A) - (s), (B) - (p), (C) - (q), (D) - (r)

Answer 2

The correct matching is as follows:

• (A) Simple cubic and face-centered cubic belong to the same crystal system.

• (B) Cubic and rhombohedral both have the parameters $a = b = c$ and $\alpha = \beta = \gamma$.

• (C) Cubic and tetragonal are two distinct crystal systems.

• (D) Hexagonal and monoclinic each have only two crystallographic angles of $90^\circ$.