MCQOPTIONS
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MCQOPTIONS
This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your SRMJEEE knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An effective way of purifying liquids containing suspensions is |
| A. | crystallization |
| B. | decanting |
| C. | centrifuging |
| D. | separating funnel |
| Answer» D. separating funnel | |
| 2. |
To separate components of liquid air, useful procedure is |
| A. | centrifugation |
| B. | separating funnel |
| C. | fractional distillation |
| D. | simple distillation |
| Answer» D. simple distillation | |
| 3. |
A pure liquid can be separated from a solution through |
| A. | separating funnel |
| B. | fractional distillation |
| C. | centrifuging |
| D. | simple distillation |
| Answer» E. | |
| 4. |
In chromatography, different pigments can be separated through |
| A. | solubility differences |
| B. | diffusion differences |
| C. | attraction among particles |
| D. | capillary action of the chromatography paper |
| Answer» B. diffusion differences | |
| 5. |
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 | |
| 6. |
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 | |
| 7. |
Suspensions can be successfully separated through |
| A. | simple or fractional distillation |
| B. | decanting and centrifugation |
| C. | boiling points |
| D. | chromatographs |
| Answer» C. boiling points | |
| 8. |
Liquid-liquid immiscible mixtures can be separated through |
| A. | chromatography |
| B. | fractional distillation |
| C. | separating funnel |
| D. | vacuum distillation |
| Answer» D. vacuum distillation | |
| 9. |
Pure ice melts at exactly |
| A. | −100 °C |
| B. | zero °C |
| C. | 10 °C |
| D. | 20°C |
| Answer» C. 10 °C | |
| 10. |
A range of boiling point indicates, |
| A. | that chromatography is not correctly done |
| B. | that fractional distillation has been carried out successfully |
| C. | that it has got impurities |
| D. | that any impurity is absent |
| Answer» D. that any impurity is absent | |
| 11. |
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 | |
| 12. |
A dissolved solid can be separated from solution through |
| A. | simple filtration |
| B. | sublimation |
| C. | evaporation |
| D. | decanting |
| Answer» D. decanting | |
| 13. |
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 | |
| 14. |
Impurities, |
| A. | lower the boiling point |
| B. | lower the freezing point |
| C. | lower melting points |
| D. | raise the melting point |
| Answer» D. raise the melting point | |
| 15. |
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 | |
| 16. |
In order to separate colors, dyes and amino acids, useful method will be |
| A. | crystallization |
| B. | centrifugation |
| C. | filtration |
| D. | chromatography |
| Answer» E. | |
| 17. |
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 | |
| 18. |
After centrifugation when sublimate settles, clear liquid |
| A. | can be allowed to rest |
| B. | can be allowed to form crystals |
| C. | can be decanted off |
| D. | can be evaporated |
| Answer» D. can be evaporated | |
| 19. |
In fractionating column of fractional distillation, higher in column |
| A. | the temperature becomes lower |
| B. | the temperature becomes higher |
| C. | minimum absorption is carried out |
| D. | risks of sublimation exists |
| Answer» B. the temperature becomes higher | |
| 20. |
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 | |
| 21. |
A purple stain is obtained if ninhydrin spray is used to locate |
| A. | peptones |
| B. | protean |
| C. | protein |
| D. | amino acids |
| Answer» E. | |
| 22. |
Presence of impurities in ethanol (C2H5OH) will cause |
| A. | lower the boiling point |
| B. | raise the boiling point |
| C. | the boiling at an exact temperature |
| D. | lower rate of evaporation |
| Answer» C. the boiling at an exact temperature | |
| 23. |
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 | |
| 24. |
Range of −5 oC to −25 oC is of |
| A. | depression of freezing point of ice |
| B. | latent heat of freezing |
| C. | melting salted ice |
| D. | melting pure ice |
| Answer» D. melting pure ice | |
| 25. |
Elevation of boiling points occur due to |
| A. | presence of impurities |
| B. | a reduced pressure |
| C. | a high pressure |
| D. | lower rate of evaporation |
| Answer» B. a reduced pressure | |
| 26. |
Chromatography is especially useful for |
| A. | foods |
| B. | drugs |
| C. | salt solutions |
| D. | Both A and B |
| Answer» E. | |
| 27. |
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 | |
| 28. |
Iodine-salt mixture can be separated through |
| A. | simple distillation |
| B. | simple filtration |
| C. | sublimation |
| D. | fractional distillation |
| Answer» D. fractional distillation | |
| 29. |
Liquids that mix together are called as |
| A. | mixtures |
| B. | miscible |
| C. | immiscible |
| D. | fraction |
| Answer» C. immiscible | |
| 30. |
Distillate formed after distillation is |
| A. | a diluted solution |
| B. | may contain impurities |
| C. | a condensed solution |
| D. | a concentrated solution |
| Answer» D. a concentrated solution | |
| 31. |
Fresh sea water is referred to as impure because |
| A. | it contains only oxygen |
| B. | it contains aquatic animals |
| C. | it contains aquatic plants |
| D. | it contains dissolved salts |
| Answer» E. | |
| 32. |
Crystallization of microchips does not involve |
| A. | a solute |
| B. | a crystal |
| C. | a solvent |
| D. | a soluble |
| Answer» D. a soluble | |
| 33. |
Dissolving, filtering and evaporating are methods of |
| A. | ice melting |
| B. | purification |
| C. | diffusion |
| D. | change of state |
| Answer» C. diffusion | |
| 34. |
Oil and water is an example of |
| A. | miscible |
| B. | impure substances may also form the crystals |
| C. | filtrate |
| D. | suspension |
| Answer» C. filtrate | |
| 35. |
Pure substances |
| A. | have fixed and exact boiling point |
| B. | have fixed and exact melting points |
| C. | form only one post on chromatogram |
| D. | all of these |
| Answer» E. | |
| 36. |
Filtrate refers to the |
| A. | insoluble solid in the filtration |
| B. | solution which dissolves |
| C. | crystals |
| D. | solution that passes through the filtrate funnel |
| Answer» E. | |
| 37. |
Traces of water can be removed from ethanol distillate |
| A. | through evaporation of water |
| B. | through decanting water |
| C. | through the use of vacuum distillation |
| D. | through the use of a suitable during agent |
| Answer» E. | |
| 38. |
A solid that reappears from solution is called |
| A. | sublimate |
| B. | residue |
| C. | immiscible |
| D. | crystal |
| Answer» E. | |
| 39. |
Locating agent of amino acids is |
| A. | Diazo reagent |
| B. | ninhydrin spray |
| C. | Amphoteric oxides |
| D. | neutral oxides |
| Answer» C. Amphoteric oxides | |
| 40. |
Chromatography refers to the |
| A. | concentration of chromium in a substance |
| B. | mass of chromium |
| C. | mass of chromium |
| D. | testing of the alkalinity or acidity |
| Answer» D. testing of the alkalinity or acidity | |
| 41. |
Phase that never gains in sublimation is |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | vapors |
| Answer» C. gas | |
| 42. |
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 | |
| 43. |
Larger crystals can be obtained if the |
| A. | evaporation is at high temperature |
| B. | evaporation rate is slow |
| C. | evaporation rate is fast |
| D. | evaporation speed remains stable |
| Answer» C. evaporation rate is fast | |
| 44. |
Condensed solid produced during sublimation is |
| A. | crystals |
| B. | sublimate |
| C. | residue |
| D. | insoluble |
| Answer» C. residue | |
| 45. |
While forming crystals, it is important to |
| A. | evaporate to dryness to get purest possible crystals |
| B. | attach the gas syringes to collect fumes |
| C. | not evaporate the water of crystallization |
| D. | use high flames |
| Answer» D. use high flames | |
| 46. |
When hot molten liquid cools, |
| A. | the first crystals are the most pure |
| B. | impure substances may also form the crystals |
| C. | it turns into gas |
| D. | it turns into aqueous solution |
| Answer» B. impure substances may also form the crystals | |
| 47. |
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 | |
| 48. |
Alternative techniques to crystallization involve |
| A. | decanting |
| B. | centrifuging |
| C. | filtration |
| D. | Both A and B |
| Answer» E. | |
| 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. |
Crude oil can be fractionally distilled to produce |
| A. | diesel |
| B. | petrol |
| C. | paraffin |
| D. | all of these |
| Answer» E. | |