MCQOPTIONS
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MCQOPTIONS
This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Maharashtra CET knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the Cartesian product of A = {1, 2} and B = {a, b}? |
| A. | {(1, a), (1, b), (2, a), (b, b)} |
| B. | {(1, 1), (2, 2), (a, a), (b, b)} |
| C. | {(1, a), (2, a), (1, b), (2, b)} |
| D. | {(1, 1), (a, a), (2, a), (1, b)} |
| Answer» D. {(1, 1), (a, a), (2, a), (1, b)} | |
| 2. |
On addition of one ml solution of 10 to 10 ml gold sol in the presence of 0.25 gm of starch, the coagulation is just prevented. Starch has the following gold number [MP PET/PMT 1988] |
| A. | 0.025 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 250 |
| Answer» E. | |
| 3. |
Zig-zag motion (eratic motion) of particles in colloid was observed by [CPMT 1985] |
| A. | Tyndall |
| B. | Zsigmondy |
| C. | Robert brown |
| D. | Thomas Graham |
| Answer» D. Thomas Graham | |
| 4. |
If the dispersed phase is a liquid and the dispersion medium is a solid, the colloid is known as [NCERT 1981; CBSE PMT 1989; KCET 1998] |
| A. | A sol |
| B. | An emulsion |
| C. | A gel |
| D. | A foam |
| Answer» D. A foam | |
| 5. |
Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol [MNR 1991; UPSEAT 1999] |
| A. | K4[Fe(CN)6] |
| B. | K2CrO4 |
| C. | KBr |
| D. | K2SO4 |
| Answer» D. K2SO4 | |
| 6. |
The random or zig-zag motion of the colloidal particles in the dispersion medium is referred to as [CPMT 1985; JIPMER 1997; MP PET 2000] |
| A. | Electro-osmosis |
| B. | Electrophoresis |
| C. | Brownian movement |
| D. | Tyndall effect |
| Answer» D. Tyndall effect | |
| 7. |
Which one is an example of gel |
| A. | Soap |
| B. | Cheese |
| C. | Milk |
| D. | Fog |
| Answer» C. Milk | |
| 8. |
Sky looks blue due to [MNR 1986; MP PET 1992] |
| A. | Dispersion effect |
| B. | Reflection |
| C. | Transmission |
| D. | Scattering |
| Answer» E. | |
| 9. |
Which of the following is most effective in coagulating a ferric hydroxide sol [MP PET 1993, 97; MP PMT 2000] |
| A. | KCl |
| B. | KNO3 |
| C. | K2SO4 |
| D. | K3[Fe(CN)6] |
| Answer» E. | |
| 10. |
Starch dispersed in hot water is an example of |
| A. | Emulsion |
| B. | Hydrophobic sol |
| C. | Lyophilic sol |
| D. | Associated colloid |
| Answer» D. Associated colloid | |
| 11. |
As2S3 sol has a negative charge. Capacity to precipitate it is highest in [CPMT 1982, 89, 93; DPMT 1983;MP PET 1999] |
| A. | AlCl3 |
| B. | Na3PO4 |
| C. | CaCl2 |
| D. | K2SO4 |
| Answer» B. Na3PO4 | |
| 12. |
Which of the following statements is not true for a lyophobic sol |
| A. | It can be easily solvated |
| B. | It carries charge |
| C. | The coagulation of this sol is irreversible in nature |
| D. | It is less stable in a solvent |
| Answer» B. It carries charge | |
| 13. |
Which of the following statement is wrong for lyophobic sol |
| A. | Dispersed phase is generally in organic material |
| B. | Can be easily coagulated by small addition of electrolyte |
| C. | Dispersed phase particles are poorly hydrated and colloid is stabilised due to charge on the colloidal particles |
| D. | Reversible in nature that is after coagulation can be easily set into colloidal form |
| Answer» E. | |
| 14. |
Gold number is [MP PET/PMT 1988] |
| A. | The number of mg of lyophilic colloid which should be added to 10 ml of ferric hydroxide sol so as to prevent its coagulation by the addition of 1 ml of 10% sodium chloride solution |
| B. | The number of mg of lyophilic colloid which should be added to 10 ml of standard gold sol so as to prevent its coagulation by the addition of 1 ml of 10% NaCl |
| C. | The mg of gold salt to be added to a lyophilic colloid to coagulate it |
| D. | The mg of an electrolyte required to coagulate a colloid |
| Answer» C. The mg of gold salt to be added to a lyophilic colloid to coagulate it | |
| 15. |
Which of the following forms cationic miscelles above certain concentration [CBSE PMT 2004] |
| A. | Urea |
| B. | Cetyltrimethylammonium bromide |
| C. | Sodium dodecyl sulphate |
| D. | Sodium acetate |
| Answer» E. | |
| 16. |
The density of gold is 19 g/cm3 . If 1.9×10−4g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per mm3 of the sol will be [Pb.CET 2004] |
| A. | 1.9×1012 |
| B. | 6.3×1014 |
| C. | 6.3×1010 |
| D. | 2.4×106 |
| Answer» E. | |
| 17. |
Identify the gas which is readily adsorbed by activated charcol [KCET 2004] |
| A. | N2 |
| B. | SO2 |
| C. | H2 |
| D. | O2 |
| Answer» C. H2 | |
| 18. |
The function of gum-arabic in the preparation of indian ink is |
| A. | Coagulation |
| B. | Peptization |
| C. | Protective action |
| D. | Absorption |
| Answer» D. Absorption | |
| 19. |
Which of the following does not contain a hydrophobic structure [NCERT 1983] |
| A. | Linseed oil |
| B. | Lanolin |
| C. | Glycogen |
| D. | Rubber |
| Answer» E. | |
| 20. |
Point out the false statement [MP PET 1997] |
| A. | Brownian movement and Tyndall effect is shown by colloidal systems |
| B. | Gold number is a measure of the protective power of a lyophilic colloid |
| C. | The colloidal solution of a liquid in liquid is called is gel |
| D. | Hardy?Schulze rule is related with coagulation |
| Answer» D. Hardy?Schulze rule is related with coagulation | |
| 21. |
Gold number gives [NCERT 1987; MNR 1987; UPSEAT 2002; Kurukshetra CET 2002; MP PMT 2004] |
| A. | The amount of gold present in the colloid |
| B. | The amount of gold required to break the colloid |
| C. | The amount of gold required to protect the colloid |
| D. | None of these |
| Answer» E. | |
| 22. |
The capacity to bring about coagulation increases with |
| A. | Ionic radii |
| B. | Atomic radii |
| C. | Valency of an ion |
| D. | Size of an ion |
| Answer» D. Size of an ion | |
| 23. |
Colloidal solution of arsenious sulphide can be prepared by [AMU 1985] |
| A. | Electrodispersion method |
| B. | Peptization |
| C. | Double decomposition |
| D. | Hydrolysis] |
| Answer» D. Hydrolysis] | |
| 24. |
Example of intrinsic colloid is |
| A. | Glue |
| B. | Sulphur |
| C. | Fe |
| D. | As2S3 |
| Answer» B. Sulphur | |
| 25. |
Which one of the following is not represented by sols [MP PMT 1992] |
| A. | Absorption |
| B. | Tyndall effect |
| C. | Tyndall effect |
| D. | Paramagnetism |
| Answer» E. | |
| 26. |
A catalyst is used in a reaction to [CPMT 1972, 75, 97; DPMT 1982] |
| A. | Change the nature of reaction products |
| B. | Increase the reaction yield |
| C. | Decrease the need for reactants |
| D. | Decrease the time required for the reaction |
| Answer» E. | |
| 27. |
Which of the following electrolytes is most effective in the coagulation of gold solution [KCET 1996] |
| A. | NaNO3 |
| B. | K4[Fe(CN)6] |
| C. | Na3PO4 |
| D. | MgCl2 |
| Answer» C. Na3PO4 | |
| 28. |
Size of colloidal particles is [CPMT 1984; MP PMT 1990, 92] |
| A. | 0.1mμ to 0.001mμ |
| B. | 10μ to 20μ |
| C. | 0.05mμ to 0.1mμ |
| D. | 25μ to 30μ |
| Answer» B. 10μ to 20μ | |
| 29. |
Which is not colloidal [CPMT 1984; MP PET 1989, 91] |
| A. | Chlorophyll |
| B. | Egg |
| C. | Ruby glass |
| D. | Milk |
| Answer» E. | |
| 30. |
Which one of the following is an incorrect statement for physisorption [MP PET 2002] |
| A. | It is a reversible process |
| B. | It requires less heat of adsorption |
| C. | It requires activation energy |
| D. | It takes place at low temperature |
| Answer» D. It takes place at low temperature | |
| 31. |
The ability of an ion to bring about coagulation of a given colloid depends upon [CPMT 1980; MP PET/PMT 1988; CBSE PMT 1997; MP PMT 1989; MP PET 1994] |
| A. | Its size |
| B. | The magnitude of its charge only |
| C. | The sign of its charge |
| D. | Both the magnitude and the sign of its charge |
| Answer» E. | |
| 32. |
The decomposition of hydrogen peroxide can be slowed by the addition of a small amount of acetamide. The latter acts as a [MNR 1978] |
| A. | Detainer |
| B. | Stopper |
| C. | Promoter |
| D. | Inhibitor |
| Answer» E. | |
| 33. |
A catalyst is a substance which [IIT 1983] |
| A. | Increases the equilibrium concentration of the product |
| B. | Changes the equilibrium constant of the reaction |
| C. | Shortens the time to reach equilibrium |
| D. | Supplies energy to the reaction |
| Answer» D. Supplies energy to the reaction | |
| 34. |
Which of the following methods is used for sol destruction [CPMT 1988] |
| A. | Condensation |
| B. | Dialysis |
| C. | Diffusion through animal membrane |
| D. | Addition of an electrolyte |
| Answer» E. | |
| 35. |
Which of the following is contributed towards the extra stability of lyophilic colloids [CPMT 1983] |
| A. | Hydration |
| B. | Charge |
| C. | Colour |
| D. | Tyndall effect |
| Answer» B. Charge | |
| 36. |
Which of the following statement about the zeolites is false? [CBSE AIPMT 2004] |
| A. | They have open structure which enables them to take up small molecules. |
| B. | Zeolites are aluminosilicates having three dimensional network. |
| C. | Some of the SiO4-4 units are replaced by AlO4-5 and AlO6-9 ion in zeolites |
| D. | They are used as cation exchangers |
| Answer» E. | |
| 37. |
Which one of the followings forms micelles in aqueous solution above certain concentration? [CBSE AIPMT 2005] |
| A. | Dodecyl trimethyl ammonium chloride |
| B. | Glucose |
| C. | Urea |
| D. | Pyridinium chloride |
| Answer» B. Glucose | |
| 38. |
Which of the following electrolyte will have maximum flocculation value for Fe (OH)3sol.? [Karnataka CET 2006] |
| A. | Na2S |
| B. | (NH4)3PO4 |
| C. | K2SO4 |
| D. | NaCl |
| Answer» E. | |
| 39. |
In Langmuir's model of adsorption of a gas on a solid surface [AIEEE 2006] |
| A. | the adsorption at a single site on the surface may involve multiple molecules at the same time.b |
| B. | the mass of gas striking a given area of surface is proportional to the pressure of the gas |
| C. | the mass of gas striking a given area of surface is independent of the pressure of the gas |
| D. | the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered. |
| Answer» C. the mass of gas striking a given area of surface is independent of the pressure of the gas | |
| 40. |
A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to [CBSE AIPMT 2006] |
| A. | n |
| B. | 1/n |
| C. | log K |
| D. | - log K |
| Answer» C. log K | |
| 41. |
The Langmuir adsorption isotherm is deduced using the assumption [CBSE AIPMT 2007] |
| A. | The adsorbed molecules interact with each other. |
| B. | The adsorption takes place in multilayers. |
| C. | The adsorption sites are equivalent in their ability to adsorb the particles. |
| D. | The heat of adsorption varies with coverage |
| Answer» D. The heat of adsorption varies with coverage | |
| 42. |
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005 respectively. The correct order of their protective powers is [AIEEE 2008] |
| A. | B < D < A < C |
| B. | D < A < C < B |
| C. | C < B < D < A |
| D. | A < C < B < D |
| Answer» E. | |
| 43. |
Rate of physical adsorption increase with [Karnataka CET 209] |
| A. | increase in temperature |
| B. | decrease in pressure |
| C. | decrease in temperature |
| D. | decrease in surface area |
| Answer» D. decrease in surface area | |
| 44. |
Which of the following statements is incorrect regarding physisorption? [AIEEE 2009] |
| A. | It occurs because of van der Walls forces |
| B. | More easily liquefiable gases are adsorbed readily |
| C. | Under high pressure it results into multimolecular layer on adsorbent surfaceb |
| D. | Enthalpy of adsorption (ΔHadsorption) is low and positive |
| Answer» E. | |
| 45. |
Among the electrolytes Na2SO4, CaCl2, Al2(SO4)3 and NH4Cl, the most effective coagulating agent for Sb2S3 sol is [IIT-JEE 2009] |
| A. | Na2SO4 |
| B. | CaCl2 |
| C. | Al2(SO4)3 |
| D. | NH4Cl |
| Answer» D. NH4Cl | |
| 46. |
Which one of the following does not involve coagulation? [Karnataka CET 2010] |
| A. | Peptization |
| B. | Formation of delta regions |
| C. | Treatment of drinking water by potash alum |
| D. | Clotting of blood by the use of ferric chloride |
| Answer» B. Formation of delta regions | |
| 47. |
Which one of the following is an example for homogenous catalysis? [Karnataka CET 2010] |
| A. | Hydrogenation of oil |
| B. | Manufacture of ammonia by Habers process |
| C. | Manufacture of sulphuric acid by Contact process |
| D. | Hydrolysis of sucrose in presence of dilute hydrochloric acid |
| Answer» E. | |
| 48. |
The protecting power of lyophilic colloidal sol is expressed in terms of [CBSE AIPMT 2012] |
| A. | Critical miscelle concentration |
| B. | Oxidation number |
| C. | Coagulation value |
| D. | Gold number |
| Answer» E. | |
| 49. |
Which one of the following statement is incorrect about enzyme catalysis? [CBSE AIPMT 2012] |
| A. | Enzymes are denaturated by ultraviolet rays and at high temperature |
| B. | Enzymes are least reactive at optimum temperature |
| C. | Enzymes are mostly proteinous in nature |
| D. | Enzyme action is specific |
| Answer» C. Enzymes are mostly proteinous in nature | |
| 50. |
In Freundlich Adsorption isotherm, the value of 1/n is [CBSE AIPMT 2012] |
| A. | 1 in case of physical adsorption |
| B. | 1 in case of chemisorption |
| C. | Between 0 and 1 in all cases |
| D. | Between 2 and 4 in all cases |
| Answer» D. Between 2 and 4 in all cases | |