Chemistry : Part I for Class XII
Surface Chemistry - 01

Instructions 
1. All questions are compulsary.
2. Please give the explanation for the answer where applicable.
3. To view the answer, click on the Answer link alongside the Question.
You can view the answer when the link becomesGreen Red. on completion of allocated time.

Q.1) Define adsorption? (1 Marks) 

Q.2) What is meant by critical temperature of gas? (1 Marks) 

Q.3) Give the expression for Fruendlich adsorption isotherm. (1 Marks) 

Q.4) How does a catalyst increase the rate of a reaction? (2 Marks) 

Q.5) What is the difference between the lock-key model and the induced-fit model of enzyme action? (2 Marks) 

Q.6) How are solutions different from colloids? (2 Marks) 

Q.7) Why lyophilic colloids are called reversible sols while lyophobic sols are called irreversible sols? (3 Marks) 

Q.8) What is emulsion? What are their different types? (2 Marks) 

Q.9) Describe the preparation of the following colloidal solution.
(a) Silver sol
(b)Sulphur sol (3 Marks) 

Q.10) Compare the coagulating power of AlCl3 with that of NaCl. Given that their coagulation values are 0.0930 and 52 respectively. (3 Marks)