Q21 / 160 · TS EAMCET 2022 (18 Jul Shift 2) · Chemistry

The correct option for axial distances and axial angles for hexagonal crystal system is

  • A
    a≠b≠c,α≠β≠γ=90°
  • B
    a=b≠c,α=β=γ=90°
  • Correct answer
    C
    a=b≠c,α=β=90°,γ=120°
  • D
    a≠b≠c,α=β=γ=90°

Solution

Hexagonal crystal system comprises four axes. The three axes are all contained within a single plane (called the basal plane) and are at 120°. They intersect each other at an angle of sixty degrees. The fourth axis intersects other axes at right angles. The edges at the base have equal length and the edges present at right angles have different length form the edges at the base. Hence, axial distances and axial angles are a=b≠c, α=β=90°, γ=120°

Hence, the correct answer is option: 'C'.

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