Question 1. The most commonly used adsorbent for chromatographic separation of organic compounds is
Question 2. A freshly prepared precipitate is peptised by adding FeCl3 solution. The charge on the colloidal particles is due to the preferential adsorption of
Question 3 . Substances whose solutions can readily diffuse through parchment membrane are
Question 4. Why is alum added to water containing suspended impurities?
Question 5. Movement of dispersion medium under the influence of electric field is known as
Question 6. Which of the following is not a method of removing impurities from a colloidal sol?
Question 7. Volume of one mole of any gas at NTP is
Question 8. Tyndall effect confirms the
Question 9. Which one of the following is alyophilic colloid?
Question 10. Which of the following is not correct for enzyme catalysis?
Question 11. Presence of traces of arsenious oxide (As2O3) in the reacting gases SO2 and O3 in presence of plantinised asbestos in contact process acts as
Question 12. Shape selective catalysis is a reaction catalysed by
Question 13. Which of the following types of metals make the most efficient catalyst?
Question 14. The oxide of nitrogen which acts as a catalyst in lead chamber process is
Question 15. The activity of an enzyme becomes ineffective
Question 16. Which of the following can adsorb larger volume of hydrogen gas?
Question 17. Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?
Question 18. Which kind of catalysis can be explained on the basis of adsorption theory ?
Question 19. A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as
Question 20. Which of the following will not form a colloidal system?
Question 21. Fog in an example of colloidal system of
Question 22. Substances which behave as normal electrolytes solution at low concentration and exhibit colloids properties at higher concentration are called
Question 23. Which of the following acts as the best coagulating agent for ferric hydroxide sol?
Question 24. The formation of micelles takes place only above
Question 25. The size of colloidal particles ranges between
Question 26. At CMC (critical micelle concentration) the surface molecules
Question 27. Which of the following is not a method for coagulation of lyophobic sols?
Question 28. The substances which behave as colloidal solutions at higher concentration are called
Question 29. Which one of the following is an example of adsorption?
Question 30. At 15oC out of H2, CH4, CO2, NH3, which gas will be adsorbed maximum by charcoal?
Question 31. Which of the following colloids are solvent hating?
Question 32. If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as
Question 33. The process of separating a crystalloid, from a colloid by filtration is called
Question 34. The movement of colloidal particles towards the oppositely charged electrodes on passing electric current is known as
Question 35. An emulsifier is a substance which
Question 36. Which of the following kinds of catalysis can be explained by the adsorption theory?
Question 37. The volume of gases H2, CH4, CO2 and NH3 adsorbed by 1 gm charcoal at 293 K can be given in the order?
Question 38. The particles of a particular colloidal solution of arsenic trisulphide (As2S3) are negatively charged. Which 0.0005M solution of the following salts would be most effective in coagulating this colloidal solution?
Question 39. Which is readily absorbed by activational charcoal
Question 40. Molecules at the surface of solid have…………energy than molecules those inside
Question 41. The adsorption of H2 on glass takes place: for this adsorption
Question 42. Mainly which colligative property is used to determine the molar mass of a polymer?
Question 43. When the particle size of a dispersed phase in colloidal solution increases
Question 44. Find the incorrect statement
Question 45. The presence of soluble soap as a emulsifying agent generally forms the formation of emulsion of
Question 46. A substance which completely destroys or reduces the activity of the catalyst is called
Question 47. Adsorption isostere is
Question 48. The migration of positively-charged colloidal particles under an electrical field, towards the cathode is called
Question 49. After increasing temperature, the rate of physiosorption :
Question 50. If all the electrolytes are removed from the colloid by persistent dialysis then