MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Surface Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Arrange the following in decreasing Lewis acid strength -PF3, PCI3, PBr3, Pl3 |
| A. | Pl3 > PBr3 > PCl3 > PF3 |
| B. | PF3 > PCl3 > PBr3 > Pl3 |
| C. | PCl3 > PBr3 > Pl3 > PF3 |
| D. | PBr3 > Pl3 > PF3 > PCl3 |
| Answer» B. PF3 > PCl3 > PBr3 > Pl3 | |
| 2. |
Movement of dispersion medium under the influence of electric field is known as |
| A. | electrodialysis |
| B. | electrophoresis |
| C. | electroosmosis |
| D. | cataphoresis |
| Answer» D. cataphoresis | |
| 3. |
Why is alum added to water containing suspended impurities? |
| A. | To make acolloidal solution |
| B. | To coagulate the suspended impurities |
| C. | To remove impurities of calcium and magnesium |
| D. | To protect the colloidal solution from gening precipitated |
| Answer» C. To remove impurities of calcium and magnesium | |
| 4. |
At CMC (critical micelle concentration) the surface molecules |
| A. | dissociate |
| B. | associate |
| C. | become bigger in size due to adsorption |
| D. | become smaller in size due to decomposition |
| Answer» C. become bigger in size due to adsorption | |
| 5. |
Which of the following is not a method for coagulation of lyophobic sols? |
| A. | By electrophoresis |
| B. | By mixing oppositely charged sols |
| C. | By adding electrolyte |
| D. | By adding a protective colloid |
| Answer» E. | |
| 6. |
Shape selective catalysis is a reaction catalysed by |
| A. | zeolite |
| B. | enzymes |
| C. | platinum |
| D. | Ziegler-Natta catalyst |
| Answer» B. enzymes | |
| 7. |
Presence of traces of arsenious oxide (As2O3) in the reacting gases SO2 and O3 in presence of plantinised asbestos in contact process acts as |
| A. | catalytic promoter |
| B. | catalytic poison |
| C. | dehydrating agent |
| D. | drying agent |
| Answer» C. dehydrating agent | |
| 8. |
Tyndall effect confirms the |
| A. | gravity effect on the sol. particles |
| B. | light scattering by the sol. particles |
| C. | heterogeneous nature of sols. |
| D. | Brownian motion of the sol. particles |
| Answer» D. Brownian motion of the sol. particles | |
| 9. |
Which of the following is not correct for enzyme catalysis? |
| A. | The enzyme activity is maximum at optimum pH which is between 5-7 |
| B. | Each enzyme is specific for a given reaction |
| C. | The favourable temperature range of enzyme activity is between 25-37 C |
| D. | The enzymatic activity is increased in presence of certain substances.called co-enzymes |
| Answer» D. The enzymatic activity is increased in presence of certain substances.called co-enzymes | |
| 10. |
Which one of the following is alyophilic colloid? |
| A. | Milk |
| B. | Gum |
| C. | Fog |
| D. | Blood |
| Answer» C. Fog | |
| 11. |
Volume of one mole of any gas at NTP is |
| A. | 11.2 litre |
| B. | 22.4 litre |
| C. | 10.2 litre |
| D. | 22.8 litre |
| Answer» C. 10.2 litre | |
| 12. |
Fog in an example of colloidal system of |
| A. | liquid in gas |
| B. | gas in liquid |
| C. | solid in gas |
| D. | gas in solid |
| Answer» B. gas in liquid | |
| 13. |
Which of the following will not form a colloidal system? |
| A. | Solid-gas |
| B. | Liquid-gas |
| C. | Gas-gas |
| D. | Gas-liquid |
| Answer» D. Gas-liquid | |
| 14. |
Substances which behave as normal electrolytes solution at low concentration and exhibit colloids properties at higher concentration are called |
| A. | lyophilic colloids |
| B. | lyophobic colloids |
| C. | macromolecular colloids |
| D. | associated colloids |
| Answer» E. | |
| 15. |
A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as |
| A. | gel |
| B. | sol |
| C. | emulsion |
| D. | aerosol |
| Answer» B. sol | |
| 16. |
Which of the following can adsorb larger volume of hydrogen gas? |
| A. | Finely divided platinum |
| B. | Colloidal solution of palladium |
| C. | Small pieces of palladium |
| D. | A single metal surface of platinum |
| Answer» C. Small pieces of palladium | |
| 17. |
Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask? |
| A. | H2 |
| B. | O3 |
| C. | N2 |
| D. | SO2 |
| Answer» E. | |
| 18. |
Which kind of catalysis can be explained on the basis of adsorption theory ? |
| A. | Homogeneous catalysis |
| B. | Heterogeneous catalysis |
| C. | Negative catalysis |
| D. | Auto catalysis |
| Answer» C. Negative catalysis | |
| 19. |
The activity of an enzyme becomes ineffective |
| A. | at low temperature |
| B. | at atmospheric pressure |
| C. | at high temperature |
| D. | in aqueous medium |
| Answer» D. in aqueous medium | |
| 20. |
Which of the following types of metals make the most efficient catalyst? |
| A. | Alkali metals |
| B. | Transition metals |
| C. | Inner transition metals |
| D. | Alkaline earth metals |
| Answer» C. Inner transition metals | |
| 21. |
The oxide of nitrogen which acts as a catalyst in lead chamber process is |
| A. | NO |
| B. | NO2 |
| C. | N2O4 |
| D. | H2O5 |
| Answer» B. NO2 | |
| 22. |
The formation of micelles takes place only above |
| A. | critical temperature |
| B. | Kraft temperature |
| C. | inversion temperature |
| D. | absolute temperature |
| Answer» C. inversion temperature | |
| 23. |
The size of colloidal particles ranges between |
| A. | 10-7 10-8 cm |
| B. | 10-9 10-11 cm |
| C. | 10-4 10-7 cm |
| D. | 10-2 10-3 cm |
| Answer» D. 10-2 10-3 cm | |
| 24. |
Which of the following acts as the best coagulating agent for ferric hydroxide sol? |
| A. | Potassium ferrocyanide |
| B. | Potassium chloride |
| C. | Potassium oxalate |
| D. | Aluminium chloride |
| Answer» B. Potassium chloride | |
| 25. |
Which of the following is not a method of removing impurities from a colloidal sol? |
| A. | Electrodialysis |
| B. | Ultrafiltration |
| C. | Ultra centrifugation |
| D. | Distillation |
| Answer» E. | |
| 26. |
The substances which behave as colloidal solutions at higher concentration are called |
| A. | associated colloids |
| B. | multimolecular colloids |
| C. | macromolecular colloids |
| D. | protective colloids |
| Answer» B. multimolecular colloids | |