MCQOPTIONS
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MCQOPTIONS
This section includes 252 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Molecular formula of a compound is |
| A. | 2 x its empirical formula |
| B. | 3 x its empirical formula |
| C. | 4 x its empirical formula |
| D. | n x its empirical formula |
| Answer» E. | |
| 52. |
Carbon and hydrogen are estimated in organic compounds by |
| A. | Kjeldahl's method |
| B. | Dum's method |
| C. | Liebig's method |
| D. | Carius method |
| Answer» D. Carius method | |
| 53. |
Cyanogen on hydrolysis with dil, HCI gives |
| A. | Formic acid |
| B. | Acetic acid |
| C. | Glycol |
| D. | Oxalic acid |
| Answer» E. | |
| 54. |
Sublimation is a process in which a solid |
| A. | Changes into another allotropic form |
| B. | Changes into liquid form |
| C. | Changes into vapour form |
| D. | None of the above |
| Answer» D. None of the above | |
| 55. |
In cold countries, ethylene glycol is added in the water used in the radiators of cars during water. This results in |
| A. | Lowering in freezing point |
| B. | Reducing the viscosity |
| C. | Reducing the specific heat |
| D. | Making water a better conductor of electricity |
| Answer» B. Reducing the viscosity | |
| 56. |
Which of the following is not linked with methane ? |
| A. | Marsh gas |
| B. | Natural gas |
| C. | Producer gas |
| D. | Coal gas |
| Answer» D. Coal gas | |
| 57. |
A fractionating column is used in |
| A. | Sublimation |
| B. | distillation |
| C. | fractional distillation |
| D. | Chromatography |
| Answer» D. Chromatography | |
| 58. |
Which of the following has highest knocking property ? |
| A. | Aromatic hydrocarbon |
| B. | Olefins |
| C. | Branched chain paraffins |
| D. | Straight chain paraffins |
| Answer» E. | |
| 59. |
Azeotropic mixtures |
| A. | Boil at different temperature |
| B. | Are mixtures of solids |
| C. | Are constant boiling mixtures |
| D. | None of the above |
| Answer» D. None of the above | |
| 60. |
Oils are purified by |
| A. | Fractional distillation |
| B. | Steam distillation |
| C. | Vacuum distillation |
| D. | Simple distillation |
| Answer» C. Vacuum distillation | |
| 61. |
Chromatography technique is used for the separation of |
| A. | Small sample of mixture |
| B. | Plant pigments |
| C. | Dye stuffs |
| D. | All of these |
| Answer» E. | |
| 62. |
Which of the following is the best scientific method to test presence of water in aliquid ? |
| A. | Smell |
| B. | Taste |
| C. | Use of the litmus paper |
| D. | Use of anhydrous copper sulphate |
| Answer» E. | |
| 63. |
In which among the following molecules is the distance between two adjacent carbon atoms largest ? |
| A. | Benzene |
| B. | Ethane |
| C. | Ethene |
| D. | Ethyene |
| Answer» C. Ethene | |
| 64. |
Fermentation is an/a |
| A. | Endothermic reaction |
| B. | Exothermic reaction |
| C. | Polymerisation reaction |
| D. | Condensation reaction |
| Answer» C. Polymerisation reaction | |
| 65. |
Which of the following is used in synthetic lemonade ? |
| A. | Tartaric acid |
| B. | Acetic acid |
| C. | Citric acid |
| D. | Oxalix acid |
| Answer» D. Oxalix acid | |
| 66. |
A mixture of naphthalene and benzoic acid can be separated by |
| A. | Chromatography |
| B. | Sublimation |
| C. | Fractional crystallisation |
| D. | Distillation |
| Answer» B. Sublimation | |
| 67. |
Resonance is due to |
| A. | Delocalisation of sigma-electrons |
| B. | Delocalisation of pi-electrons |
| C. | Migration of H-atoms |
| D. | Migration of protons |
| Answer» C. Migration of H-atoms | |
| 68. |
Dynamite is prepared by mixing nitroglycerine with |
| A. | Saw dust and ammonium nitrate |
| B. | Cellulose nitrate |
| C. | Saw dust alone |
| D. | Conc. sulphur acid |
| Answer» B. Cellulose nitrate | |
| 69. |
Paraldehyde is used as |
| A. | Medicine |
| B. | Poison |
| C. | Polymer |
| D. | Dye |
| Answer» B. Poison | |
| 70. |
Copper wire test of halogens is known as |
| A. | Liebig's test |
| B. | Lassaigne's test |
| C. | Fusion test |
| D. | Beilstein's test |
| Answer» E. | |
| 71. |
Denatured spirit is mainly used as a |
| A. | Drug |
| B. | Good fuel |
| C. | Material in preparing |
| D. | Solvent in preparing varnishes |
| Answer» E. | |
| 72. |
Who is called the father of chemistry ? |
| A. | Faraday |
| B. | Wohler |
| C. | Berzelius |
| D. | Lavoisier |
| Answer» E. | |
| 73. |
Which of the following is generally present in tonics ? |
| A. | Ethanol |
| B. | Ether |
| C. | Ethanal |
| D. | Chloral |
| Answer» B. Ether | |
| 74. |
The knocking will be minimum when the mixture of fuel is |
| A. | Straight chained |
| B. | iso-carbonation |
| C. | Neo-carbonation |
| D. | None of these |
| Answer» D. None of these | |
| 75. |
Which is the primary component natural gas ? |
| A. | Methane |
| B. | Butane |
| C. | Propene |
| D. | Ethane |
| Answer» B. Butane | |
| 76. |
Which are is the following is the weakest base ? |
| A. | Trimethylamine |
| B. | Diethylamine |
| C. | Ethylamine |
| D. | Ammonia |
| Answer» B. Diethylamine | |
| 77. |
Aminea are more basic than |
| A. | Alcohols |
| B. | Ethers |
| C. | Esters |
| D. | All of these |
| Answer» E. | |
| 78. |
Which one of the following is used to remove ink and rust stains and cloth ? |
| A. | Oxalic acid |
| B. | Alcohol |
| C. | Ether |
| D. | Kerosene oil |
| Answer» B. Alcohol | |
| 79. |
A compound which does not give a positive test in Lassaigne's test nitrogen is ? |
| A. | Urea |
| B. | Hydrazine |
| C. | Azobenzene |
| D. | Phenyl hydrazine |
| Answer» C. Azobenzene | |
| 80. |
Which of the following is used as a hypnotic ? |
| A. | Paraldehyde |
| B. | Metaldehyde |
| C. | Acetaldehyde |
| D. | Formaldehyde |
| Answer» B. Metaldehyde | |
| 81. |
Fruity smell is given by |
| A. | Esters |
| B. | Alcohols |
| C. | Chloroform |
| D. | Acid anhydride |
| Answer» B. Alcohols | |
| 82. |
The chromatography technique was developed by |
| A. | Soxhlet |
| B. | Tswett |
| C. | Victor grignard |
| D. | Liebig |
| Answer» C. Victor grignard | |
| 83. |
Carbon black is obtained when methane is |
| A. | Heated in absence of air |
| B. | Heated in presence of nitrogen |
| C. | Heated in presence of ammonia |
| D. | Heated with steam |
| Answer» B. Heated in presence of nitrogen | |
| 84. |
Compound having some number and king of atoms but different arrangement of atoms in their molecules are called |
| A. | Allotropes |
| B. | Isotopes |
| C. | Isomers |
| D. | Polymers |
| Answer» D. Polymers | |
| 85. |
Glycerol is purified by |
| A. | Steam distillation |
| B. | Vacuum distillation |
| C. | Fractional distillation |
| D. | Simple distillation |
| Answer» C. Fractional distillation | |
| 86. |
Two immiscible liquids are separated by |
| A. | Separating funnel |
| B. | Fractional distillation |
| C. | Chromatography |
| D. | Sublimation |
| Answer» B. Fractional distillation | |
| 87. |
Formula which represents a simple ratio of atoms of different element present in a molecule of the substance is called |
| A. | Molecular formula |
| B. | Empirical formula |
| C. | Structural formula |
| D. | None of these |
| Answer» C. Structural formula | |
| 88. |
Liebig test is used to estimate |
| A. | H |
| B. | C |
| C. | C and H both |
| D. | N |
| Answer» D. N | |
| 89. |
Which hydrocarbon is mainly present in gobar gas ? |
| A. | Butane |
| B. | Propane |
| C. | Methane |
| D. | Ethane |
| Answer» D. Ethane | |
| 90. |
The geometry of methane molecule is |
| A. | Terahedral |
| B. | Pyramidal |
| C. | Octahedral |
| D. | Square planer |
| Answer» B. Pyramidal | |
| 91. |
Iso-octane is added to petrol |
| A. | To precipitate inorganic meterial |
| B. | To prevent freezing of petrol |
| C. | To increasing the boiling point |
| D. | As an antiknocking agent |
| Answer» E. | |
| 92. |
The name of the poisonous gas formed by the interaction of acetylene arsenic trichloride is |
| A. | Phosgene |
| B. | Lewisite |
| C. | Mustard gas |
| D. | Weston |
| Answer» C. Mustard gas | |
| 93. |
Fehling's solution is |
| A. | Acidified copper sulphate solution |
| B. | Ammoniacal cuprous chloride solution |
| C. | Copper sulphate and Rochelle salt + NaOH |
| D. | None of the above |
| Answer» D. None of the above | |
| 94. |
An aqueous solution of urea is |
| A. | Acidic |
| B. | Basic |
| C. | Neutral |
| D. | Amphoteric |
| Answer» D. Amphoteric | |
| 95. |
Which one of the following is the correct sequence in increasing order of molecular weight of the hydrocarbon ? |
| A. | Methane, ethane, propane and butane |
| B. | Propane, butane, ethane and methane |
| C. | Butane, ethane, propane and methane |
| D. | Butane, propane, ethane and methane |
| Answer» B. Propane, butane, ethane and methane | |
| 96. |
Water and alcohol can be separated from a mixture by |
| A. | Fractional distillation |
| B. | Sublimation |
| C. | Decantation |
| D. | Evaporation |
| Answer» B. Sublimation | |
| 97. |
A mixture of water and NaCI can separated by |
| A. | Sublimation |
| B. | Evaporation |
| C. | Decantation |
| D. | Filtration |
| Answer» C. Decantation | |
| 98. |
Acetylene is used as an anaesthetic under the name of |
| A. | Narcylene |
| B. | Pyrene |
| C. | Neopyrene |
| D. | Pyroline |
| Answer» B. Pyrene | |
| 99. |
Denatured spirit is a mixture of ethyl alcohol, methyl alcohol and |
| A. | Acelic acid |
| B. | Pyridine |
| C. | Acetone |
| D. | Water |
| Answer» C. Acetone | |
| 100. |
Urea is converted into ammonia and carbon dioxide by the enzyme |
| A. | Diastase |
| B. | Urease |
| C. | Lipase |
| D. | Amylase |
| Answer» C. Lipase | |