Fundamentholfundamenthol
JEE Main2026Jan 23, Shift 1Chemistry
Q.

Which one of the following graphs accurately represents the plot of partial pressure of CS vs its mole fraction in a mixture of acetone and CS at constant temperature?

  1. A
  2. B
  3. C
  4. D
Solution

Acetone (CHCOCH) and CS form a mixture that shows positive deviation from Raoult's law: the dipole–dipole interactions in pure acetone are disrupted on mixing with non-polar CS, so molecules escape more readily into the vapour and the observed partial pressure exceeds the ideal value.

for all intermediate compositions, giving a curve that bows upward from the Raoult-law straight line — matching option (1).

← Back to full paper

Practice more Chemistry

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →