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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper II, Chemistry · Q75 of 120

Geo-Scientist Prelims 2020 Chemistry Q75: What will be the effect of dilution on specific and equivalent…

QuestionElectrochemistry / dilution

What will be the effect of dilution on specific and equivalent conductance of an aqueous solution of a strong electrolyte?

  1. (a) The specific conductance decreases and equivalent conductance increases
  2. (b) The specific conductance increases and equivalent conductance decreases
  3. (c) Both will increase
  4. (d) Both will decrease

Answer: (a) The specific conductance decreases and equivalent conductance increases

On dilution: κ (specific conductance) decreases — fewer ions per cm³. Λ (equivalent/molar) increases — interionic attraction falls and Λ = κ × 1000/c → (a).

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