Which of the following pairs of aqueous solutions will form a precipitate when mixed?
a) na2 so4 + koh
b) cas + na2so4
c) k2co3 + nacl
d) none of these solution pairs will produce a precipitate.
e) all of these solution pairs will produce a precipitate.

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.