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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 · 2017 · Mains Paper II

Q9. Energy of atomising a water drop

Question

A spherical water drop of radius 1.0 mm is sprayed into one million equal droplets. Find the work done if the surface tension is 72.0 dyn cm⁻¹.

Answer in brief

The reversible surface work is 8.96×10⁻⁵ J.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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CoversEnergy of atomising a water dropSurface chemistry