(a) What is coagulation of sol ? name two methods by which a lyophobic sol can be coagulated.
(b) What is the change in enthalpy and entropy during adsorption of gas on a solid ? 

What is coagulation of a sol? Name two methods by which a lyophobic sol can be coagulated.

Name two methods by which a lyophillic sol can be coagulated.

(a) What are lyophilic and lyophobic sols ? Give one example for each. (b) What is Tyndall effect ?

What are lyophilic and lyophobic sols ? Give are example of each type. Why are hydrophobic sols easily coagulated ?

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following : (a) What is the final pressure of the gas in A and B ? (b) What is the change in internal energy of the gas ? (c) What is the change in the temperature of the gas ? (d) Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface ?

(a) Complete and balance the following reaction (i) SO_(2) + H_2S overset("Oxidation")(rarr) (ii) FeCl_3 + H_2O overset("Hydrolysis")(rarr) (b) Mention two characteristics of enzyme catalysis (c) What is the sign of DeltaS for the adsorption of gas on solids?