Home
Class 12
CHEMISTRY
(a) What is coagulation of sol ? name tw...

(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 ? 

Text Solution

Verified by Experts

(a) The process of settling of colloidal particles is called coagulation of the sol.
By electrophoresis or by boiling or by adding an electrolyte or by mixing two oppositely charged sols.
(b) Enthalpy decreases or `DeltaH` is negative. Entropy decreases or `DeltaS` is negative.
Promotional Banner

Topper's Solved these Questions

  • SURFACE CHEMISTRY

    OSWAAL PUBLICATION|Exercise TOPIC - 3 (COLLOIDS, TYPES OF COLLOIDS, CHARACTERISTICS AND PREPARATION OF COLLOIDS)(LONG ANSWER TYPE QUESTIONS-I)|8 Videos

  • SOLVED PAPER II PUC TOPPER'S ANSWER MARCH-2015

    OSWAAL PUBLICATION|Exercise PART -D|30 Videos

Similar Questions

Explore conceptually related problems

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?