Which of the following preocesses are accompained by increase of entropy.
a. Dissolution of iodine in a solvent
b. `HCI` is added to `AgNO_(3)` and a precipitate of `AgCI` is obtained.
c. A partition is removed to allow two gases to mix.

Based on the given diagram, which of the following statements regarding the homogenous solution of two volatile liquids are correct? (1) Plots AD and BC show that Raoult's law is obeyed for the solution in which B is a solvent and A is the solute and as well as for that in which A is solvent and B is solute. (2) Plot CD shows that Dalton's law of partial pressures is obeyed by the binary solution of components A and B. (3) EF + EG = EH; and AC and BD correspond to the vapour pressure of the pure solvents A and B respectively.

Give reason for the following : (a) Formation of NH_(3) from its elemets at constant pressure is accompained by a decrease in volume. (b) Nitric oxide turns in air. (c ) Copper dissolves in HNO_(3) but not in HCI. (d) Pb (NO_(3))_(2) on heating produces a pale yellow gas which on strong heating produces brown gas.