SURFACE CHEMISTRY PAPER CBSE XII

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      TEST     CLASS - XII CHEMISTRY (Surface chemistry)

                                                                                      MM-35
                                                                                      TIME-60 MIN

      Q1 what is observed when light is passed through a colloidal solution?           [1]

      Q2.State Hardy- Schulze rule. ?                                                                                  [1]

     Q3. What is a protective colloid?                                                                                 [1]
                                
     Q4.  What is flocculation?                                                                                            [1]
 
      Q5.  Alum is used for purification of water. Why?                                                   [1]

      Q6.  Define the term peptization?                                                                              [1]
 

      Q7. . What are the two types of emulsions?                                                           [1]

     Q8. . How does an emulsifying agent work? Give an example.?

     Q9. What are associated colloids? Give an example?                                       [1]

    Q10. What is CMC and Kraft’s temperature?                                                     [1]

    Q11. What are colloids?                                                                                              [1]

    Q12. What is the range of particle size in colloids?                                                [1]

   Q13. Colloid is a state not a substance. Explain?                                               [1]

    Q14. Give two examples of solid Sol and Gel?                                                                 [1]

Q15 .How is a colloidal solution purified by dialysis?                                          [2]

Q16. Write any two Example of emulsifying agent.                                               [2]

Q17. . Define the terms –

      (a)  Brownian movement       (b) Electrophoresis?                                         [2]


 Q18..  Differentiate between lyophobic and lyophillic sol?                                    [2]


 Q19... Give two examples of substances that form: –                                          [2]

(        a)  Hydrophobic sol.

(        b)  Hydrophilic sol.


  Q20.  Differentiate between multimolucular and macromolecular colloid?            [3]                                                               

  Q21. . Write the equation for formation of                                                             [3]

(          a)  Sulphur sol.

(             b)  Ferric hydroxide sol.

    Q22. Give three applications of colloidal solutions?                                                      [3]

    Q23. What is dispersed phase and dispersion medium in                                          [3]

           (i)sol (ii) Aerosol (iii) Foam?
                        
                                      BY- DR SUDHIR TOMAR

     

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