Solutions
- 1.8 g of glucose (molar mass 180 g mol-1) is dissolved in 100 g of water. The elevation in boiling point is (\(K_b=0.52\) K kg mol-1) Answer: D. 0.052 K m=0.01/0.1=0.1 mol kg⁻¹; Δ T_b=0.52×0.1=0.052 K. 1
- The osmotic pressure of a 0.1 M aqueous solution of a non-electrolyte at 300 K is (R = 0.082 L atm K-1 mol-1) Answer: C. 2.46 atm π=CRT=0.1×0.082×300=2.46 atm. 1
- Which of the following liquid pairs shows a negative deviation from Raoult's law? Answer: C. Acetone + chloroform Acetone and chloroform form hydrogen bonds with each other, so the A–B attraction is stronger than A–A and B... 1