NTA Abhyas JEE Main2020ChemistrySolutionsPractice
Identify the correct statement:
Options
- A0.1 M NaCl and 0.1 M glucose solution are isotonic.
- B0.1 M NaCl and 0.3 M glucose solution are isotonic.
- CThe boiling point of 0.1 m aqueous urea solution is less than 0.1 m aqueous KCl solution.
- DThe freezing point of 0.1 m glucose solution is less than 0.1 m KCl solution.
Correct answer
C. The boiling point of 0.1 m aqueous urea solution is less than 0.1 m aqueous KCl solution.
Step-by-step solution
π NaCl = i × CRT π glucose = 1 × 0 .1 × RT = 2 × 0 .1 RT = 0 .1 RT = 0.2 RT π N a C l ≠ π g l u cos e ΔT b NaCl = 2 × 0.1   K f ;     ΔT b urea = 0.1   K f Hence, Δ T b u r e a < Δ T b N a C l