Direction : question contains statements given in two columns, which have to be matched. The statements in Column-I are labelled A, B, C and D, while the statements in Column-II are labelled p, q, r, s and t. Any given statement in Column-I can have correct matching with ONE OR MORE statement(s) in
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 × 4 matrix given in the ORS.
(A) Simple cubic and face-centered cubic parameters
(p) have these parameters, a = b = c and α = β = γ
(B) cubic and rhombohedral
(q) are two crystal systems
(C) cubic and tetragonal
(r) have only two crystallo-graphic angles of 90°
(D) hexagonal and monoclinic
(s) belong to same crystal system
(A - p, s); (B - p, q); (C - q); (D - q, r).
A→ p, s; Parameters of a cubic system are a = b = c and α = β = γ= 90°
There are three types of lattices in cubic system
These are simple, Face centred and body centred B→ p, q ; The parameters of a Rhombohedral system are a = b = c; α = β = γ = 90°
Cubic and Rhombohedral are two crystal systems. There are seven crystal systems in all C→ q; These are two crystal systems.
D→ q, r; Hexagonal and monoclinic are two crystal systems.
The parameters of these are
Hexagonal; a = b ≠ c and α = β = 90°, r = 120°
Monoclinic ; a ≠ b ≠ c and α = γ = 90°,β ≠ 90°
Integer Value Correct Type Question
Q. The number of hexagonal faces that are present in a truncated octahedron is (2011)