CBSE PREVIOUS YEAR QUESTIONS OF CHAPTER5 (SURFACE CHEMISTRY) - CLASS12 CHEMISTRY

 

2007

1. Describe the following types of colloids , giving an example for each:

a) Multimolecular colloids    b) Macromolecular colloids

2. Explain with example:

a) Shape selective catalysis     b) Dialysis

2008

1. Of physisorption and chemisorptions which type of adsorption has a higher enthalpy of adsorption?

2. Explain what is observed

(i) when a beam of light is passed through a colloidal sol.

(ii) an electrolyte, KCl  is added to hydrated ferric oxide sol.

(iii) electric current is passed through a colloidal sol?

3. Differentiate between multimolecular and macromolecular colloids. Give one example of each. How are these two types of colloids different from associated colloids?

4. Describe ‘electrophoresis’ briefly

2009

1. What is the ‘coagulation’ process?

2.  Explain what is observed

(i) when a beam of light is passed through a colloidal sol.

(ii) an electrolyte is added to hydrated ferric oxide sol.

(iii) an electric current is passed through a colloidal sol?

2010

1. Describe the following :

a) Tyndall effect        b) Shape selective catalysis

2. What is meant by coagulation of a colloidal solution? Name any method by which coagulation of lyophobic sols can be carried out.

3. Define the following:

a) Peptization  b) Reversible sols

2011

1. What is meant by shape selective catalysis?

2. Classify colloids where the dispersion medium is water. State their characteristics and write an example of each of these classes.

3. What are lyophobic colloids? Give one example for them

2012

1. Define peptization .

2. Explain the following terms with suitable example:

a) Aerosol       b) Emulsion     c) Micelle

3. What is meant by shape selective catalysis?

4. Define peptization.  

5. Write the distinct features of chemisorptions which are not found in physisorptions.

2013

(a)  physisorption or chemisorption, which has a higher enthalpy of adsorption ?

(b) Define the following terms given an example of each

(i) Associated colloids  (ii) Lyophillic solution    (iii) Adsorption

(c ) Give characteristics and example:

Multimolecular colloid  (ii) Lyophobic sols  (iii) Emulsions

2014

What is the Effect of temperature on chemisorption?                                  

What are emulsions? What are their different types? Give one example of each type.                                                                                                           

Why is adsorption always exothermic?

2015

1. What is the type of charge on AgI colloidal sol formed when AgNO3 solution is added to KI?

2. Differentiate between the following :

a) solution and colloid       b) homogeneous catalysis and heterogeneous catalysis

c) O/W emulsion and W/O emulsion

2016

1. Write the main reason for the stability of colloidal sols

2. Define :  a) Peptization    b) Zeta potential    b) Brownian movement

2017

What type of colloid is formed when a liquid is dispersed in a solid ? Give an example.

What type of colloid is formed when a solid is dispersed in a liquid ? Give an example.

What type of colloid is formed when a gas is dispersed in a liquid ? Give an example.

Write one difference :  a) Multimolecular and associated colloid

b) Coagulation and peptization   c ) Homogeneuos and heterogeneous catalysis

Write the dispersed phase and dispersion medium of milk

Write one similarity between physisorption and chemisorptions

Write the chemical method by which Fe(OH)₃ sol is prepared from FeCl_3.

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MANISH KR SONI

PGT CHEMISTRY

KV BONDAMUNDA