Direction : question contains statements given in two columns, which have to be matched. The statements in ColumnI are labelled A, B, C and D, while the statements in ColumnII are labelled p, q, r, s and t. Any given statement in ColumnI can have correct matching with ONE OR MORE statement(s) in
ColumnII
Qn.
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.
Column I  Column II 
(A) Simple cubic and facecentered 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 crystallographic angles of 90° 
(D) hexagonal and monoclinic  (s) belong to same crystal system 
Ans:
(A  p, s); (B  p, q); (C  q); (D  q, r).
Solution:
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)
Ans: b
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