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UPSC Civil Services (Mains)

Chemistry optional

  • 2 papers
  • 250 marks each
  • 3 h per paper
  • 5 of 8 questions, Q1 and Q5 compulsory

Paper I covers physical and inorganic chemistry.

UPSC Civil Services (Mains), Chemistry optional · 2022 · Paper I

Q4(c). Capillary rise of two liquids in the same tube

Question

Consider two liquids A and B such that A has half of the surface tension and twice the density of B. If liquid A rises to a height of 2.0 cm in a capillary, what will be the height to which liquid B will rise in the same capillary?

Answer in brief

hB = hA × (γB/γA) × (ρA/ρB) = 2.0 × 2 × 2 = 8.0 cm.

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Coverscapillary risesurface tensioncapillary actioncontact angledensity

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