MCQOPTIONS
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MCQOPTIONS
This section includes 168 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Distilled water |
| A. | has some impurities left in it |
| B. | is very pure water |
| C. | is obtained through fractional distillation |
| D. | is obtained through decanting |
| Answer» C. is obtained through fractional distillation | |
| 2. |
Liquids that mix together are called as |
| A. | mixtures |
| B. | miscible |
| C. | immiscible |
| D. | fraction |
| Answer» C. immiscible | |
| 3. |
Suspensions can be successfully separated through |
| A. | simple or fractional distillation |
| B. | decanting and centrifugation |
| C. | boiling points |
| D. | chromatographs |
| Answer» C. boiling points | |
| 4. |
Stationary phase forms a thin |
| A. | film |
| B. | coating |
| C. | slide |
| D. | cover |
| Answer» B. coating | |
| 5. |
To record temperature of a liquid over time, devices used are called as |
| A. | data loggers |
| B. | scanners |
| C. | bar code readers |
| D. | probes |
| Answer» E. | |
| 6. |
Examples of sublimate does not include |
| A. | ammonium salts |
| B. | nitrates |
| C. | iodine |
| D. | naphthalene |
| Answer» D. naphthalene | |
| 7. |
A purple stain is obtained if ninhydrin spray is used to locate |
| A. | peptones |
| B. | protean |
| C. | protein |
| D. | amino acids |
| Answer» E. | |
| 8. |
If a substance decomposes when heated to its boiling point, suitable method is |
| A. | simple distillation |
| B. | fractional distillation |
| C. | vacuum distillation |
| D. | crystallization |
| Answer» D. crystallization | |
| 9. |
Pure stearic acid melts at exactly |
| A. | 78 °C |
| B. | 70 °C |
| C. | below 70 °C |
| D. | above 80 °C |
| Answer» C. below 70 °C | |
| 10. |
Filtration is useful when |
| A. | only one solid is soluble |
| B. | both solids are soluble |
| C. | both solids are insoluble |
| D. | when both liquids are miscible |
| Answer» B. both solids are soluble | |
| 11. |
Chromatography can be used to |
| A. | form mixtures |
| B. | change mixture compositions |
| C. | separate mixtures into pure substances |
| D. | all of these |
| Answer» D. all of these | |
| 12. |
Vacuum distillation is used |
| A. | under high pressures |
| B. | under low pressures |
| C. | on gentle heating |
| D. | upon quick heating |
| Answer» C. on gentle heating | |
| 13. |
Distillate is a liquid that |
| A. | mixes together |
| B. | condenses after distillation |
| C. | does not sink due to very fine particles |
| D. | a substance that will not dissolve |
| Answer» C. does not sink due to very fine particles | |
| 14. |
A pure liquid can be separated from a solution through |
| A. | separating funnel |
| B. | fractional distillation |
| C. | centrifuging |
| D. | simple distillation |
| Answer» E. | |
| 15. |
To separate components of liquid air, useful procedure is |
| A. | centrifugation |
| B. | separating funnel |
| C. | fractional distillation |
| D. | simple distillation |
| Answer» D. simple distillation | |
| 16. |
Water-soluble gases do not include |
| A. | ammonia |
| B. | carbon dioxide |
| C. | hydrogen |
| D. | oxygen |
| Answer» D. oxygen | |
| 17. |
When heating begins in miscible solutions, vapors formed will be |
| A. | of liquid, lower in boiling point |
| B. | of liquid, higher in boiling point |
| C. | of both liquids with a higher concentration of liquid having low boiling point |
| D. | collected in a gas syringe |
| Answer» D. collected in a gas syringe | |
| 18. |
Sublimation, dissolving and filtration can only be carried out in |
| A. | soluble-substances in solution |
| B. | insoluble substances in liquids |
| C. | liquid-liquid mixtures |
| D. | solid-solid mixtures |
| Answer» E. | |
| 19. |
Liquid-liquid immiscible mixtures can be separated through |
| A. | chromatography |
| B. | fractional distillation |
| C. | separating funnel |
| D. | vacuum distillation |
| Answer» D. vacuum distillation | |
| 20. |
Fractional distillation is particularly useful if objective is to |
| A. | form crystals |
| B. | examine sublimates |
| C. | examine a immiscible solution of two liquids |
| D. | separate a miscible solution of two liquids |
| Answer» E. | |
| 21. |
100 cm3, 250 cm3 and 1 dm3 can be measured using |
| A. | measuring cylinder |
| B. | beaker |
| C. | volumetric flask |
| D. | burette |
| Answer» D. burette | |
| 22. |
Liquids that do not mix and can be separated in a separating funnel are called as |
| A. | miscible |
| B. | residue |
| C. | sublimate |
| D. | immiscible |
| Answer» E. | |
| 23. |
Inorganic impurities during solvent extraction remains in the |
| A. | ether layer |
| B. | aqueous layer |
| C. | middle layer |
| D. | at the bottom |
| Answer» C. middle layer | |
| 24. |
Paper chromatography is done by |
| A. | 5 ways |
| B. | 2 ways |
| C. | 3 ways |
| D. | 4 ways |
| Answer» D. 4 ways | |
| 25. |
Approximate volume can be measured through |
| A. | volumetric flask |
| B. | burette |
| C. | measuring cylinder |
| D. | beaker |
| Answer» D. beaker | |
| 26. |
After collection crystals are washed with solvent, which should be |
| A. | hot |
| B. | cold |
| C. | dilute |
| D. | polar |
| Answer» C. dilute | |
| 27. |
Crude oil can be fractionally distilled to produce |
| A. | diesel |
| B. | petrol |
| C. | paraffin |
| D. | all of these |
| Answer» E. | |
| 28. |
To prepare solutions of known concentration, apparatus used can be |
| A. | pipette |
| B. | burette |
| C. | measuring cylinder |
| D. | volumetric flask |
| Answer» E. | |
| 29. |
Addition of salt in water will |
| A. | lower the boiling point |
| B. | lower the freezing point |
| C. | raise the boiling point |
| D. | raise the melting point |
| Answer» D. raise the melting point | |
| 30. |
In paper chromatography stationary phase is |
| A. | water |
| B. | solid or liquid |
| C. | gas |
| D. | solution |
| Answer» B. solid or liquid | |
| 31. |
Liquid-liquid miscible mixtures can be separated through |
| A. | chromatography |
| B. | fractional distillation |
| C. | filtration |
| D. | both a and b |
| Answer» E. | |
| 32. |
Locating agent of amino acids is |
| A. | Diazo reagent |
| B. | ninhydrin spray |
| C. | Amphoteric oxides |
| D. | neutral oxides |
| Answer» C. Amphoteric oxides | |
| 33. |
In Liebig condenser, |
| A. | the coldest part of the condenser is at the top |
| B. | the water enters in the jacket from the top |
| C. | the coldest part of the condenser is at the bottom |
| D. | the water enters in the jacket from the middle tubules |
| Answer» D. the water enters in the jacket from the middle tubules | |
| 34. |
Chromatography is especially useful for |
| A. | foods |
| B. | drugs |
| C. | salt solutions |
| D. | both a and b |
| Answer» E. | |
| 35. |
Diazo reagent is used as a locating agent in chromatography of |
| A. | picric acids |
| B. | benzoic acids |
| C. | phenolic acids |
| D. | salicylic acid |
| Answer» D. salicylic acid | |
| 36. |
Solvents used in crystallization should be |
| A. | miscible |
| B. | immiscible |
| C. | polar |
| D. | non polar |
| Answer» B. immiscible | |
| 37. |
Instrument used to heat inflammable liquids in crystallization is |
| A. | flame |
| B. | wire gauze |
| C. | hot plate |
| D. | water bath |
| Answer» E. | |
| 38. |
In chromatography, a locating agent is a chemical that reacts to produce |
| A. | a condensed solution |
| B. | a concentrated solution |
| C. | a visible colored product |
| D. | a range of pH colors |
| Answer» D. a range of pH colors | |
| 39. |
Crystallization, evaporation and distillation is a mean of |
| A. | separating soluble substances in solution |
| B. | separating insoluble substances in solutions |
| C. | separating filtrate from the solution |
| D. | all of these |
| Answer» B. separating insoluble substances in solutions | |
| 40. |
In vacuum distillation, substance boils at |
| A. | its exact temperature |
| B. | a temperature slightly above its boiling point |
| C. | a temperature below its boiling point |
| D. | under high pressures |
| Answer» D. under high pressures | |
| 41. |
Gases denser than air include |
| A. | carbon dioxide |
| B. | oxygen |
| C. | hydrogen |
| D. | ammonia |
| Answer» B. oxygen | |
| 42. |
A dissolved solid can be separated from solution through |
| A. | simple filtration |
| B. | sublimation |
| C. | evaporation |
| D. | decanting |
| Answer» D. decanting | |
| 43. |
An easy way to separate soluble and insoluble solids is |
| A. | filtration |
| B. | decanting |
| C. | sublimation |
| D. | distillation |
| Answer» B. decanting | |
| 44. |
Crystallization of microchips does not involve |
| A. | a solute |
| B. | a crystal |
| C. | a solvent |
| D. | a soluble |
| Answer» D. a soluble | |
| 45. |
Through separating funnel, immiscible solutions |
| A. | cannot be dissolved |
| B. | cannot be separated completely |
| C. | can be easily decanted |
| D. | can be centrifuged |
| Answer» C. can be easily decanted | |
| 46. |
In order to lower melting point of ice, |
| A. | hot water shall be poured |
| B. | solar energy shall be waited for |
| C. | salt can be spread over the ice |
| D. | the ice shall be scrapped from the roads and doorways |
| Answer» D. the ice shall be scrapped from the roads and doorways | |
| 47. |
Presence of pesticides and herbicides can be tested through |
| A. | careful distillation |
| B. | decanting |
| C. | boiling points |
| D. | chromatographs |
| Answer» E. | |
| 48. |
Rare freezing of sea water can be explained through |
| A. | lowering the freezing point of water |
| B. | presence of impurities like salts |
| C. | presence of breathing animals in it |
| D. | elevation of the boiling point |
| Answer» C. presence of breathing animals in it | |
| 49. |
Mixtures have |
| A. | a range of boiling points |
| B. | a range of melting points |
| C. | a lack of exact concentrations |
| D. | all of these |
| Answer» E. | |
| 50. |
After centrifugation, sublimate |
| A. | dissolves completely |
| B. | remain suspended in the liquid |
| C. | settles at the bottom |
| D. | depends upon the pH of sublimate |
| Answer» D. depends upon the pH of sublimate | |