Q148 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Surface Chemistry · Topic: Surface Tension · Marks: 2 · Difficulty: Medium

A liquid of density $1.1\,\mathrm{g\,cm^{-3}}$ climbs to a height of 5.0 cm when a capillary with internal radius of 0.2 mm is dipped into it. The surface tension (in $\mathrm{N\,m^{-1}}$) of the liquid is closest to
(a)0.05
(b)0.108
(c)0.018
(d)0.005
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
γ = hρgr/2 = 0.05 × 1100 × 9.8 × 2×10⁻⁴/2 ≈ 0.054 ≈ 0.05 N m⁻¹ (a).

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