MCQOPTIONS
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MCQOPTIONS
This section includes 82 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
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. | |
| 3. |
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. | |
| 4. |
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. | |
| 5. |
Which of the following electrolytes is most effective in the coagulation of gold solution [KCET 1996] |
| A. | \[NaN{{O}_{3}}\] |
| B. | \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] |
| C. | \[N{{a}_{3}}P{{O}_{4}}\] |
| D. | \[MgC{{l}_{2}}\] |
| Answer» C. \[N{{a}_{3}}P{{O}_{4}}\] | |
| 6. |
Size of colloidal particles is [CPMT 1984; MP PMT 1990, 92] |
| A. | \[0.1\,m\,\mu \] to \[0.001\,m\,\mu \] |
| B. | \[10\,\mu \] to \[20\,\mu \] |
| C. | \[0.05\,m\,\mu \] to \[0.1\,m\,\mu \] |
| D. | \[25\,\mu \] to \[30\,\mu \] |
| Answer» B. \[10\,\mu \] to \[20\,\mu \] | |
| 7. |
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. | |
| 8. |
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 | |
| 9. |
Sulphur sol contains[UPSEAT 2002] |
| A. | Discrete sulphur atoms |
| B. | Discrete sulphur molecules |
| C. | Large agreegates of sulphur molecules |
| D. | Water dispersed in solid sulphur |
| Answer» D. Water dispersed in solid sulphur | |
| 10. |
The reason for the stability of a lyophobic sol is |
| A. | Brownian movement |
| B. | Tyndall effect |
| C. | Electric charge |
| D. | Brownian movement and electric charge |
| Answer» E. | |
| 11. |
Sky looks blue due to [MNR 1986; MP PET 1992] |
| A. | Dispersion effect |
| B. | Reflection |
| C. | Transmission |
| D. | Scattering |
| Answer» E. | |
| 12. |
Jelly is a form of |
| A. | Suspension |
| B. | Colloidal solution |
| C. | Supersaturated solution |
| D. | True solution |
| Answer» C. Supersaturated solution | |
| 13. |
Which of the following has minimum value of flocculating power[MP PET 1989, 90] |
| A. | \[P{{b}^{+2}}\] |
| B. | \[P{{b}^{+4}}\] |
| C. | \[S{{r}^{+2}}\] |
| D. | \[N{{a}^{+}}\] |
| Answer» E. | |
| 14. |
The zig-zag motion of colloidal particles is due to |
| A. | Small size of colloidal particles |
| B. | Large size of colloidal particles |
| C. | The conversion of potential energy into kinetic energy |
| D. | Bombardment on colloidal particles by molecules of dispersion medium |
| Answer» E. | |
| 15. |
Which is the correct statement in case of milk [CPMT 1977; MNR 1988; UPSEAT 2000, 01, 02] |
| A. | Milk is an emulsion of protein in water |
| B. | Milk is an emulsion of fat in water |
| C. | Milk is stabilised by protein |
| D. | Milk is stabilised by fat |
| Answer» C. Milk is stabilised by protein | |
| 16. |
Purification of colloids is done by the process of [CPMT 1988] |
| A. | Electrophoresis |
| B. | Electrodispersion |
| C. | Peptization |
| D. | Ultra-filteration |
| Answer» E. | |
| 17. |
Which of the following is an emulsifier |
| A. | Soap |
| B. | Water |
| C. | Oil |
| D. | \[NaCl\] |
| Answer» B. Water | |
| 18. |
Which of the following substances gives a positively charged sol [CPMT 1983, 84; MP PMT 1990; MP PET 1992] |
| A. | Gold |
| B. | A metal sulphite |
| C. | Ferric hydroxide |
| D. | An acidic dye |
| Answer» D. An acidic dye | |
| 19. |
Lyophilic sols are more stable than lyophobic sols because their particles are [Karala CET 2005] |
| A. | Positively charged |
| B. | Negatively charged |
| C. | All soluble |
| D. | Attract each other |
| E. | Are heavier |
| Answer» D. Attract each other | |
| 20. |
The stability of lyophilic colloids is due to [CPMT 1971, 81, 83, 93, 96; AFMC 1998; MP PMT 1990, 95; MP PET 1992] |
| A. | Charge on their particles |
| B. | A layer of dispersion medium on their particles |
| C. | The smaller size of their particles |
| D. | The large size of their particles |
| Answer» C. The smaller size of their particles | |
| 21. |
Which one of the following forms micelles in aqueous solution above certain concentration ? [CBSE PMT 2005] |
| A. | Urea |
| B. | Dodecyl trimethyl ammonium chloride |
| C. | Pyridinium chloride |
| D. | Glucose |
| Answer» C. Pyridinium chloride | |
| 22. |
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. | |
| 23. |
Bredig arc method can not be used to prepare colloidal solution of which of the following [AFMC 2004] |
| A. | Pt |
| B. | Fe |
| C. | Ag |
| D. | Au |
| Answer» C. Ag | |
| 24. |
A negatively charged suspension of clay in water will need for precipitation the minimum amount of[CPMT 1973] |
| A. | Aluminium chloride |
| B. | Potassium sulphate |
| C. | Sodium hydroxide |
| D. | Hydrochloric acid |
| Answer» B. Potassium sulphate | |
| 25. |
A colloidal system in which gas bubbles are dispersed in a liquid is known as[MP PMT 1993] |
| A. | Foam |
| B. | Sol |
| C. | Aerosol |
| D. | Emulsion |
| Answer» B. Sol | |
| 26. |
Sodium lauryl sulphate is [RPET 2003] |
| A. | Cationic sol |
| B. | Anionic sol |
| C. | Neutral sol |
| D. | None of these |
| Answer» B. Anionic sol | |
| 27. |
Colloidal solutions of gold prepared by different methods have different colours owing to [JIPMER 1999] |
| A. | The difference in the size of the colloidal particles |
| B. | The fact that gold exhibits a variable valency of + 1 and + 3 |
| C. | Different concentrations of gold |
| D. | Presence of different types of foreign particles depending upon the method of preparation of the colloid |
| Answer» B. The fact that gold exhibits a variable valency of + 1 and + 3 | |
| 28. |
Which of the following is used for the destruction of colloids [CBSE PMT 2000] |
| A. | Dialysis |
| B. | Condensation |
| C. | By ultrafiltration |
| D. | By adding electrolyte |
| Answer» E. | |
| 29. |
Ferric chloride is applied to stop bleeding cut because |
| A. | \[F{{e}^{3+}}\] ion coagulates blood, which is a negatively charged sol |
| B. | \[F{{e}^{3+}}\] ion coagulates blood, which is a positively charged sol |
| C. | \[C{{l}^{-}}\] coagulates blood, which is a positively charged sol |
| D. | \[C{{l}^{-}}\] ion coagulates blood, which is a negatively charged sol |
| Answer» B. \[F{{e}^{3+}}\] ion coagulates blood, which is a positively charged sol | |
| 30. |
Which of the following makes the lyophilic solution unstable [MP PMT 1994] |
| A. | Dialysis |
| B. | Addition of electrolyte |
| C. | Addition of alcohol |
| D. | Addition of alcohol and electrolyte both |
| Answer» E. | |
| 31. |
Small liquid droplets dispersed in another liquid is called [Pb. PMT 2000] |
| A. | Gel |
| B. | Emulsion |
| C. | Suspension |
| D. | True solution |
| Answer» C. Suspension | |
| 32. |
Which of the following statements is not true for a lyophilic sol |
| A. | It can be easily solvated |
| B. | It carries no charge |
| C. | Coagulation of this sol is reversible in nature |
| D. | It is not very stable in a solvent |
| Answer» E. | |
| 33. |
Which one of the sols acts as protective colloid [MP PMT 1990; MP PET 1990, 92; RPET 2003] |
| A. | \[A{{s}_{2}}{{S}_{3}}\] |
| B. | Gelatin |
| C. | \[Au\] |
| D. | \[Fe{{(OH)}_{3}}\] |
| Answer» C. \[Au\] | |
| 34. |
Milk is [MP PMT 1995;CPMT 1988; MP PET 1991; MNR 1982] |
| A. | Dispersed fats in oil |
| B. | Dispersed fats in water |
| C. | Dispersed water in fats |
| D. | Dispersed water in oil |
| Answer» C. Dispersed water in fats | |
| 35. |
White of an egg is partly coagulated by heating which can be again obtained back by some pepsin and little \[HCl\].This process is called |
| A. | Peptization |
| B. | Coagulation |
| C. | Precipitation |
| D. | None of these |
| Answer» B. Coagulation | |
| 36. |
Which one of the following is not a colloid[BIT 1992] |
| A. | Milk |
| B. | Blood |
| C. | Solution of urea |
| D. | Ice cream |
| Answer» D. Ice cream | |
| 37. |
If some gelatin is mixed in colloidal solution of gold, then it does |
| A. | Coagulation of gold |
| B. | Peptization of gold |
| C. | Protection of gold sol |
| D. | Protection of gelatin |
| Answer» D. Protection of gelatin | |
| 38. |
Colour of colloidal solution is due to[CPMT 1996] |
| A. | Different size of colloidal particles |
| B. | Due to formation of complex |
| C. | Due to formation of hydrated crystal |
| D. | None of these |
| Answer» B. Due to formation of complex | |
| 39. |
When a strong beam of light is passed through a colloidal solution, the light will [BHU 1996; JIPMER 1997] |
| A. | Give a rainbow |
| B. | Be scattered |
| C. | Be reflected |
| D. | Absorbed completely |
| Answer» C. Be reflected | |
| 40. |
\[_{72}^{180}X\xrightarrow{2\alpha }\xrightarrow{\beta }\xrightarrow{\gamma }\,_{Z}^{A}{X}'\].\[Z\] and \[A\]are [DPMT 2005] |
| A. | 69, 172 |
| B. | 172, 69 |
| C. | 180, 70 |
| D. | 182, 68 |
| Answer» B. 172, 69 | |
| 41. |
Consider the following nuclear reactions, \[_{92}^{238}M\to \,_{y}^{x}N+2\,_{2}^{4}He\] \[_{y}^{x}N\to \,_{B}^{A}L+2{{\beta }^{+}}\] The number of neutrons in the element L is [AIEEE 2004] |
| A. | 140 |
| B. | 144 |
| C. | 142 |
| D. | 146 |
| Answer» C. 142 | |
| 42. |
The number \[\alpha -\]and \[\beta \]- particles emitted respectively during the transformation of \[_{90}^{232}Th\ \text{to}\ _{82}^{208}Pb\]is [Kerala PMT 2004] |
| A. | 3, 6 |
| B. | 6, 3 |
| C. | 4, 6 |
| D. | 6, 4 |
| E. | 6, 8 |
| Answer» E. 6, 8 | |
| 43. |
In the Thorium series, \[_{90}Th{{}^{232}}\] loses total of 6 a-particles and 4 b-particles in ten stages. The final isotope produced in the series is [MP PET 2001] |
| A. | \[_{82}P{{b}^{209}}\] |
| B. | \[_{83}B{{i}^{209}}\] |
| C. | \[_{82}P{{b}^{208}}\] |
| D. | \[_{82}P{{b}^{206}}\] |
| Answer» D. \[_{82}P{{b}^{206}}\] | |
| 44. |
The highest binding energy per nucleon will be for [AIIMS 2001] |
| A. | Fe |
| B. | \[{{H}_{2}}\] |
| C. | \[{{O}_{2}}\] |
| D. | U |
| Answer» B. \[{{H}_{2}}\] | |
| 45. |
The number of b-particles emitted in radioactive change \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\] is [KCET 2000] |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 10 |
| Answer» D. 10 | |
| 46. |
If the quantity of a radioactive element is doubled, then its rate of disintegrationper unit time will be [NCERT 1972, 92; MP PET 1989] |
| A. | Unchanged |
| B. | Reduced to half |
| C. | Increased by \[\sqrt{2}\]times |
| D. | Doubled |
| Answer» E. | |
| 47. |
The reaction which disintegrates neutron is or neutron is emitted (which completes first) [IIT 1988; MP PMT 1991; KCET 2005] |
| A. | \[_{96}A{{m}^{240}}{{+}_{2}}H{{e}^{4}}\to {{}_{97}}B{{k}^{244}}+{{}_{+1}}{{e}^{0}}\] |
| B. | \[_{15}{{P}^{30}}\to {{\ }_{14}}S{{i}^{30}}+{{\ }_{1}}{{e}^{0}}\] |
| C. | \[_{6}{{C}^{12}}+{{\ }_{1}}{{H}^{1}}\to {{\ }_{7}}{{N}^{13}}\] |
| D. | \[_{13}A{{l}^{27}}+{{\ }_{2}}H{{e}^{4}}\to {{\ }_{15}}{{P}^{30}}\] |
| Answer» E. | |
| 48. |
\[_{84}P{{b}^{210}}{{\xrightarrow{{}}}_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\]. From the above equation, deduce the position of polonium in the periodic table (lead belongs to group IV A) [AIIMS 1980] |
| A. | II A |
| B. | IV B |
| C. | VI B |
| D. | VI A |
| Answer» E. | |
| 49. |
The end product of \[(4n+2)\] radioactive disintegration series is [MP PET 1997; Pb. PMT 1998; BHU 2000] |
| A. | \[_{82}P{{b}^{208}}\] |
| B. | \[_{82}P{{b}^{206}}\] |
| C. | \[_{82}P{{b}^{207}}\] |
| D. | \[_{83}B{{i}^{210}}\] |
| Answer» C. \[_{82}P{{b}^{207}}\] | |
| 50. |
The number of neutrons in the parent nucleus which gives \[{{N}^{14}}\] on \[\beta \]-emission and the parent nucleus is [EAMCET 1985; MNR 1992; Kurukshetra CEE 1998; UPSEAT 2000, 01] |
| A. | \[8,\,{{C}^{14}}\] |
| B. | \[6,\,{{C}^{12}}\] |
| C. | \[4,\,{{C}^{13}}\] |
| D. | None of these |
| Answer» B. \[6,\,{{C}^{12}}\] | |