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Match the following {:(,"List - I",,"L...

Match the following
`{:(,"List - I",,"List - II"),((P),"Simple cubic and face - centred cubic",(1),"Have these cell parameters a = b = c and " alpha = beta = gamma),((Q),"Cubic and rhombohedral",(2),"Are two crystal systems"),((R ),"Cubic and tetragonal",(3),"Have only two crystallography angles of " 90^(@)),((S),"Hexagonal and monoclinic",(4),"Belong to same crystal system"):}`

A

P-1,3, Q-1,2, R-2,4, S-1,3

B

P-1,2, Q-1,4, R-2,4, S-3,4

C

P-4,1, Q-1,2, R-2,3, S-1,2

D

P-1,4, Q-1,2, R-2, S-2,4

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to match the items in List - I with the appropriate items in List - II based on the characteristics of different crystal systems. Let's go through each item step by step. ### Step 1: Analyze List - I and List - II 1. **P: Simple cubic and face-centered cubic** - Both belong to the cubic crystal system. - They have cell parameters: a = b = c and α = β = γ = 90°. 2. **Q: Cubic and rhombohedral** - Cubic is a crystal system. - Rhombohedral (also known as trigonal) is another crystal system. - Both have equal edge lengths, but the angles in rhombohedral are not necessarily 90°. 3. **R: Cubic and tetragonal** - Cubic is a crystal system. - Tetragonal is another crystal system. - In tetragonal, the angles are 90°, but the edge lengths are not all equal. 4. **S: Hexagonal and monoclinic** - Hexagonal is a crystal system with two sides equal and one angle equal to 120°. - Monoclinic is another crystal system where none of the sides are equal, but two angles are 90°. ### Step 2: Match the Items 1. **P (Simple cubic and face-centered cubic)**: - Matches with (4) "Belong to the same crystal system" and (1) "Have these cell parameters a = b = c and α = β = γ". - **Match: P → (1), (4)** 2. **Q (Cubic and rhombohedral)**: - Matches with (2) "Are two crystal systems". - **Match: Q → (2)** 3. **R (Cubic and tetragonal)**: - Matches with (2) "Are two crystal systems". - **Match: R → (2)** 4. **S (Hexagonal and monoclinic)**: - Matches with (2) "Are two crystal systems" and (3) "Have only two crystallographic angles of 90°". - **Match: S → (2), (3)** ### Final Matches - P → (1), (4) - Q → (2) - R → (2) - S → (2), (3) ### Conclusion The correct matches are: - P: (1), (4) - Q: (2) - R: (2) - S: (2), (3)
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