Question

For orthorhombic system axial ratios are a ≠ b ≠ c and the
axial angles are
(a) α = β = γ ≠ 90° (b) α = β = γ =90°
(c) α = β = γ =90°,β =90° (d) α ≠ β ≠ γ =90°

Answer 1

For orthorhombic system axial ratios are a ≠ b ≠ c and the axial angles are α = β = γ =90°

- In the orthorhombic crystal system, all the edge lengths a, b and c are not same (or we can say all the edge lengths are diferent), i.e., a ≠ b ≠ c

- apart from this, in the orthorhombic crystal system, all the axial angles are at right angles to each other, or we can say that α = β = γ = 90°

- So the correct answer is option (b)