Multiple choice

Match the column – I (crystal system) with column – II (edge lengths and axial angles) and select the correct option ||| |---|---| |Column – I|Column – II| |A. Monoclinic|1. a ≠ b ≠ c, α = β = γ = 90°| |B. Tetragonal|2. a = b = c, α = β = γ ≠ 90°| |C. Orthorhombic|3. a ≠ b ≠ c, α = γ = 90°, β ≠ 90°| |D. Trigonal|4. a = b ≠ c, α = β = γ = 90°|

  1. A - 4, B - 3, C - 2, D - 1

  2. A - 3, B - 4, C - 1, D - 2

  3. A - 2, B - 1, C - 3, D - 4

  4. A - 3, B - 2, C - 4, D - 1

  5. A - 1, B - 2, C - 3, D - 4
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B Correct answer
Explanation

Crystal systems are differentiated on the basis of their edge lengths and axial angles. So, option 2 classifies them on this basis. Monoclinic - a ≠ b ≠ c, α = γ = 90°, β ≠ 90° Tetragonal - a = b ≠ c, α = β = γ = 90° Orthorhombic - a ≠ b ≠ c, α = β = γ = 90° Trigonal - a = b = c, α = β = γ ≠ 90°

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