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IIT JEE Advanced 2007 Paper 2
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Question : 44
Total: 66
Match the crystal system/unit cells mentioned in Column I with their characteristic features mentioned in Column II:
Column I
Column II
(A) Simple cubic and face-centred cubic
(P) have these cell 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.
(A)→(Q), (S); (B)→(P), (Q); (C)→(Q); (D)→(Q), (S)
(A)→(P), (S); (B)→(P), (Q); (C)→(Q); (D)→(Q), (R)
(A)→(R), (S); (B)→(P), (Q); (C)→(Q); (D)→(Q), (R)
(A)→(Q), (S); (B)→(P), (Q); (C)→(Q); (D)→(Q), (R)
Validate
Solution:
The correct matching between the crystal/unit cell systems and the parameters can be obtained based on the properties listed as follows:
Crystals Class
Axial Distances
Angles
Cubic
a = b = c
α = β = γ = 90°
Tetragonal
a = b ≠ c
α = β = γ = 90°
orthorhombic
a ≠ b ≠ c
α = β = γ = 90°
Hexagonal
a = b ≠ c
α = β = 90°
γ = 120°
Trigonal and rhombohedral
a = b = c
α = β = γ ≠ 90°
Monoclinic
a ≠ b ≠ c
α = β = 90°
γ ≠ 90°
Triclinic
a ≠ b ≠ c
α ≠ β ≠ γ ≠ 90°
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