Chapter 2 Solutions

Important Questions

  1. Define Raoult’s law of binary solution containing non-volatile solute in it.

(b) On dissolving 3.24 g of sulphur in 40 g of benzene, boiling point of solution was higher than that of benzene by 0.81K (Kb = 2.53 K kg mol-1 ). What is molecular formula of sulphur ? (Atomic mass s = 32 g mol-1 )

2. Suggest the most important type of intermolecular attractive interaction in the following pairs

(a) n-hexane and n-octane           (b) I2 and CCl4             (c) NaClO4 and water

  • If the solubility product of CuS is 6 × 10-16 , calculate the maximum molarity of CuS in aqueous solution
  • Why is liquid ammonia bottle first cooled in ice before opening it ?
  • Calculate the molarity of pure water (d = 1 g mL-1 ).
  • Why the boiling point of solution is higher than pure liquid ?
  • What is Van’t Hoff factor ?
  • (a) What is the value of i for Al2 (SO4)3 when it is completely dissociated ?

(b) Calculate the boiling point of a solution prepared by adding 15.00 g of NaCl to 250 g of water. (Kb = 0.512 K kg mol-1 and molar mass of NaCl = 58.44 g mol-1 )