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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper II

Q4. Orthorhombic crystal: interplanar spacing d(hkl)

  • 10 marks
  • Topic: Solids
  • Question only
Question

What do you mean by an orthorhombic crystal? Show that for an orthorhombic lattice, the distance d(hkl) between two crystal planes defined by (hkl) is given by 1/d² = h²/a² + k²/b² + l²/c², where a, b and c are the lengths of the edges.

Model answer

The free solution for 2016 answers questions 1, 2, 3, 5, 6, 8, 9, 10, 12 and 13, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coversorthorhombic latticeinterplanar spacingMiller indicesd-spacing formula