March 08, 2012

Surface Chemistry One Mark Questions

1. (The phenomenon of ) Tyndall effect is not observed in
a) emulsion                                                b) colloidal solution
c) true solution                                          d) suspension / none of these.
2. An emulsion is a colloidal solution of
a) two solids                                              b) two liquids
c) two gases                                              d) one solid and one liquid
3. An example of gel is
a) paint                  b) pumice-stone           c) milk                         d) curd.
4. An example of lyophilic colloid is
a) sulphur in water                                    b) phosphorus in water
c) starch                                                     d) all of these
5. Argyrol is
a) colloidal silver                                       b) colloidal antimony
c) colloidal gold                                        d) milk of magnesia.
6. Catalyst used in Deacon's method of manufacture of chlorine is
a) NO                    b) CuCl2                     c) Fe2O3                     d) Ni.
7. Coconut charcoal has a great capacity of the ------- of gases.
a) adsorption         b) absorption               c) desorption               d) all of these.
8. Colloidal medicines are more effective because
a) they are clean                                            b) they are easy to prepare
c) they are easily assimilated and adsorbed d) the germs move towards them.
9. Colloids are purified by
a) precipitation      b) Coagulation            c) Dialysis                   d) Filtration
10. Curd is a colloidal solution of
a) liquid in liquid   b) liquid in solid          c) solid in liquid          d) solid in solid.
11. Decomposition of hydrogen peroxide is retarded in the presence of
a) alcohol                                                   b) glycerin
c) Manganese dioxide, MnO2                  d) Molybdenum, Mo.
12. Emulsifying agent is used for
a) precipitation of an emulsion                  b) coagulation of an emulsion
c) stabilization of an emulsion                  d) none of these.
13. Fe(OH)3 colloidal particles adsorb _______ ions
a) Fe3+                   b) Mg2+                        c) Ca2+                         d) Cu2+
14. Fog is a colloidal solution of
a) liquid in gas       b) gas in liquid            c) gas in solid              d) solid in gas.
15. For chemisorption which is wrong?
a) It is irreversible                                                 b) It requires activation energy
c) It forms multi(molecular) layers on absorbate d) Surface compounds are formed.
16. In case of physical adsorption, there is desorption when
a) temperature decreases                           b) temperature increases
c) pressure increases                                  d) concentration increases.
17. In the reaction between oxalic acid and potassium permanganate, in the presence of dil. H2SO4 acts as an auto catalyst
a) K2SO4              b) MnSO4                   c) MnO2                      d) Mn2O3
18. Oil soluble dye is mixed with emulsion and emulsion remains colorless then, the emulsion is
a) O/W                  b) W/O                        c) O/O                                     d) W/W
19. Smoke is a colloidal solution of
a) gas in solid        b) solid in gas              c) gas in liquid             d) liquid in gas.
20. The auto catalyst in the oxidation of oxalic acid by KMnO4 is
a) K2SO4              b) MnSO4                   c) KMnO4                   d) CO2 
21. The blue colour of the sky is due to
a) Tyndall effect                                       b) Brownian movement
c) electrophoresis                                      d) electro-osmosis.
22. The catalyst used for the decomposition of KClO3 is
a) MnO2                b) Cl2                          c) V2O5                      d) Pt.
23. The colloid used for stomach disorder is
a) colloidal silver                                       b) colloidal antimony
c) colloidal gold                                        d) Milk of Magnesia.
24. The decomposition of hydrogen peroxide in the presence of colloidal platinum is a / an
a) positive catalysis           b) negative catalysis    c) auto-catalysis d) induced catalysis.
25. The emulsifying agent used in O/W emulsion is
a) long chain alcohols        b) lampblack    c) protein                     d) glycerol
26. The function of FeCl3 in the conversion of Fe(OH)3 precipitate into a colloid is
a) peptising agent b) emulsifying agent   c) reducing agent        d) precipitating agent.
27. The iron catalyst used in the Haber's process is poisoned by / The iron catalyst used in the synthesis of ammonia in Haber's process is poisoned by
a) Pt                       b) H2                           c) H2S                         d) As2O3 /
a) As2O3                      b) V2O5                       c) H2S                         d) Glycerine
28. The migration of colloidal particles under the influence of an electric field is known as
a) electro-osmosis                         b) electrolysis / hot dialysis
c) electrodialysis                            d) electrophoresis. /
a) Electro-osmosis                         b) Brownian movement
c) Electrodialysis                            d) Cataphoresis
29. The oxidation of sodium sulphite by air is retarded by
a) MnO2                b) H2S                         c) Alcohol                   d) As2O3.
30. The platinum catalyst used in the oxidation of SO2 in contact process is poisoned by
a) arsenious oxide (As2O3)                      b) vanadium pentoxide (V2O5)
c) Ferric oxide (Fe2O3)                            d) Cupric chloride (CuCl2)
31. The sky looks blue due to
a) adsorption         b) dispersion                c) reflection                 d) scatter blue light
32. The Tyndall effect is associated with colloidal particle due to
a)   scattering of light                               b) presence of charge
c) absorption / diffusion of light               d) reflection of light.
33. Which one is correct factor that explains the increase of rate of reaction by a catalyst?
a) Shape selectivity                                   b) Particle size
c) Increase of free energy                                     d) Lowering of activation energy.
34. Which one of the following factors is false regarding catalyst?
a) Small quantity is enough                                                 b) Initiate the reaction
c) Remains unchanged in mass and chemical composition d) Specific in its action.
35. Which type of colloidal is a sol?
a) solid in liquid    b) liquid in solid          c) solid in solid            d) gas in solid.