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.
| 51. |
In electronic industry, silicon is used in making |
| A. | microwave oven bodies |
| B. | television sets |
| C. | microchips |
| D. | motherboards |
| Answer» D. motherboards | |
| 52. |
Melting point of silicon is |
| A. | 410 °C |
| B. | 110 °C |
| C. | 140 °C |
| D. | 1410 °C |
| Answer» E. | |
| 53. |
In fractional distillation, a large surface area for condensation is provided through |
| A. | a thermometer |
| B. | water bath |
| C. | a fractionating column |
| D. | reflux condenser |
| Answer» D. reflux condenser | |
| 54. |
1 dm3 is equal to |
| A. | 1 Liter |
| B. | 1000 cm3 |
| C. | 1 m3 |
| D. | both a and b |
| Answer» E. | |
| 55. |
Electron balances can measure accurately up to |
| A. | 0.01g |
| B. | 0.001 g |
| C. | 0.1g |
| D. | both a and b |
| Answer» E. | |
| 56. |
Only one type of atom is found in |
| A. | organic compounds |
| B. | inorganic compounds |
| C. | pure substances |
| D. | radioactive substances |
| Answer» D. radioactive substances | |
| 57. |
In filtration, filtrate refers to the |
| A. | soluble substances that passes through the solution |
| B. | the suspension in the liquid |
| C. | the residue left on the filter paper |
| D. | substance collected over the funnel |
| Answer» B. the suspension in the liquid | |
| 58. |
Iodine-salt mixture can be separated through |
| A. | simple distillation |
| B. | simple filtration |
| C. | sublimation |
| D. | fractional distillation |
| Answer» D. fractional distillation | |
| 59. |
An agent used for decoulourization is |
| A. | sulphuric acid |
| B. | animal charcoal |
| C. | acetic acid |
| D. | alcohol |
| Answer» C. acetic acid | |
| 60. |
Phase that never gains in sublimation is |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | vapors |
| Answer» C. gas | |
| 61. |
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 | |
| 62. |
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. | |
| 63. |
Data loggers are |
| A. | data punching devices |
| B. | devices used to draw graph of temperature against time |
| C. | are a form of stop watch |
| D. | have replaced gas syringes |
| Answer» C. are a form of stop watch | |
| 64. |
Separating a liquid from a solution can be carried out through |
| A. | simple filtration |
| B. | simple distillation |
| C. | chromatography |
| D. | fractional distillation |
| Answer» C. chromatography | |
| 65. |
Oil and water is an example of |
| A. | miscible |
| B. | impure substances may also form the crystals |
| C. | filtrate |
| D. | suspension |
| Answer» C. filtrate | |
| 66. |
Solvent extraction works under principle of |
| A. | Distribution law |
| B. | chromatography |
| C. | sublimation |
| D. | separation law |
| Answer» B. chromatography | |
| 67. |
Fractional distillation can |
| A. | not separate liquids whose boiling points are close |
| B. | separate liquids whose boiling points are close |
| C. | separate liquids whose boiling points are very high |
| D. | all of these |
| Answer» C. separate liquids whose boiling points are very high | |
| 68. |
Solvent extraction is done with help of |
| A. | conical flask |
| B. | water bath |
| C. | separating funnel |
| D. | test tubes |
| Answer» D. test tubes | |
| 69. |
Sublimation is used to purify |
| A. | plasma |
| B. | gases |
| C. | solids |
| D. | liquids |
| Answer» D. liquids | |
| 70. |
To filter precipitates needed to be ignited we use |
| A. | Gooch crucible |
| B. | sintered glass crucible |
| C. | clay crucible |
| D. | plastic crucible |
| Answer» B. sintered glass crucible | |
| 71. |
Chromatography is derived from word which means |
| A. | special writing |
| B. | colour writing |
| C. | ink writing |
| D. | black writing |
| Answer» C. ink writing | |
| 72. |
Lighter gases |
| A. | may be collected through downward delivery |
| B. | may be collected by upward displacement of air |
| C. | are dried through conc. H₂SO₄ |
| D. | are dried through dilute H₂SO₄ |
| Answer» D. are dried through dilute H₂SO₄ | |
| 73. |
Crystals are collected by Gooch crucible with help of |
| A. | force |
| B. | water bath |
| C. | vacuum pump |
| D. | centrifuge |
| Answer» D. centrifuge | |
| 74. |
Chromatography with solid stationary phase is called |
| A. | circle chromatography |
| B. | Square chromatography |
| C. | solid chromatography |
| D. | adsorption chromatography |
| Answer» E. | |
| 75. |
Solvent should dissolve large amount of solute at |
| A. | cold temperature |
| B. | room temperature |
| C. | melting point |
| D. | boiling point |
| Answer» E. | |
| 76. |
Distribution coefficient is represented by |
| A. | K |
| B. | S |
| C. | H |
| D. | G |
| Answer» B. S | |
| 77. |
Usually crystals are dried with help of |
| A. | fan |
| B. | autoclave |
| C. | filter paper |
| D. | dryer |
| Answer» D. dryer | |
| 78. |
To cover one fourth of filter paper with precipitate filter paper should be |
| A. | large |
| B. | small |
| C. | medium |
| D. | light |
| Answer» B. small | |
| 79. |
Pattern on paper in chromatography is called |
| A. | chroming |
| B. | chroma |
| C. | chromatograph |
| D. | chromatogram |
| Answer» E. | |
| 80. |
Science of chemical characterization is |
| A. | Analytical chemistry |
| B. | Physical chemistry |
| C. | Organic chemistry |
| D. | Inorganic chemistry |
| Answer» B. Physical chemistry | |
| 81. |
Angle of apex of filter paper should be slightly greater than |
| A. | 35 degree |
| B. | 40 degree |
| C. | 60 degree |
| D. | 50 degree |
| Answer» D. 50 degree | |
| 82. |
Paper is dipped in solvent mixture at about |
| A. | 6-7cm |
| B. | 5-6cm |
| C. | 3-4cm |
| D. | 4-8cm |
| Answer» C. 3-4cm | |
| 83. |
Sintered glass crucible needs no |
| A. | lid |
| B. | preparation |
| C. | cover |
| D. | apparatus |
| Answer» C. cover | |
| 84. |
Process in which solid is directly converted to vapors state is called |
| A. | sublimation |
| B. | filtration |
| C. | drying |
| D. | cooling |
| Answer» B. filtration | |
| 85. |
Suspended particles are collected on |
| A. | filter paper |
| B. | sieve |
| C. | surface |
| D. | funnel |
| Answer» B. sieve | |
| 86. |
In partition chromatography stationary phase is |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | none of these |
| Answer» C. gas | |
| 87. |
Apparatus used for very accurate measurements include |
| A. | pipette |
| B. | burette |
| C. | beaker |
| D. | both a and b |
| Answer» E. | |
| 88. |
Solid which undergoes sublimation is |
| A. | argon |
| B. | iodine |
| C. | sodium chloride |
| D. | water |
| Answer» C. sodium chloride | |
| 89. |
Another method used occasionally for drying crystals is |
| A. | vacuum desiccator |
| B. | hot plate |
| C. | water bath |
| D. | gas bath |
| Answer» B. hot plate | |
| 90. |
Cooling during crystallization must be done at |
| A. | fast rate |
| B. | slow rate |
| C. | moderate rate |
| D. | very high rate |
| Answer» D. very high rate | |
| 91. |
Fine insoluble solid particles can be removed through |
| A. | crystallization |
| B. | decanting |
| C. | centrifuging |
| D. | separating funnel |
| Answer» D. separating funnel | |
| 92. |
Process quicker than filtration but not so effective is |
| A. | decanting |
| B. | centrifuging |
| C. | crystallization |
| D. | fractional distillation |
| Answer» B. centrifuging | |
| 93. |
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. | |
| 94. |
Colour appear ed after extraction of iodine is |
| A. | brown |
| B. | pink |
| C. | purple |
| D. | blue |
| Answer» D. blue | |
| 95. |
Solvent refers to the |
| A. | gas that will dissolve |
| B. | a solid which dissolves |
| C. | a liquid which does the dissolving |
| D. | a liquid that is dissolved |
| Answer» D. a liquid that is dissolved | |
| 96. |
Accurate stopwatches can measure |
| A. | up to 0.1 second |
| B. | up to 0 .01 second |
| C. | up to.001 second |
| D. | up to 0.2 second |
| Answer» C. up to.001 second | |
| 97. |
Anhydrous agent used to remove water from ethanol distillate may be |
| A. | iodine |
| B. | hydrocarbon |
| C. | calcium chloride |
| D. | naphthalene |
| Answer» D. naphthalene | |
| 98. |
Identification of an element is |
| A. | Testing |
| B. | quantitative analysis |
| C. | Qualitative analysis |
| D. | Physical test |
| Answer» D. Physical test | |
| 99. |
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. | |
| 100. |
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 | |