MCQOPTIONS
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MCQOPTIONS
This section includes 255 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Major portion of mixture of hydrocarbons like crude oil is composed of |
| A. | ester |
| B. | alcohol |
| C. | alkanes |
| D. | propane |
| Answer» D. propane | |
| 52. |
The molecular formula helps in |
| A. | writing balanced equation only |
| B. | calculating molar mass only |
| C. | calculating moles |
| D. | writing balanced equation and calculating molar mass |
| Answer» E. | |
| 53. |
The reaction in which replacement of one atom or group of atoms are involved is termed as |
| A. | addition reaction |
| B. | elimination reaction |
| C. | substitution reaction |
| D. | oxidation |
| Answer» D. oxidation | |
| 54. |
In the condensation of polymerization, monomers are involved which contain functional groups of |
| A. | same kind |
| B. | different kind |
| C. | all groups |
| D. | none of above |
| Answer» C. all groups | |
| 55. |
Breakdown of any molecule with water (H₂O) in any reaction is |
| A. | addition reaction |
| B. | elimination reaction |
| C. | substitution reaction |
| D. | hydrolysis |
| Answer» E. | |
| 56. |
Plastics we use in our everyday life is made up of |
| A. | wood |
| B. | rubber |
| C. | polymers |
| D. | none of above |
| Answer» D. none of above | |
| 57. |
Monomers of ethene in thousand numbers react together in addition- polymerization to produce |
| A. | polyethene |
| B. | polyamides |
| C. | polyesters |
| D. | polyethane |
| Answer» B. polyamides | |
| 58. |
Friedrich August Kekule's structure of 'benzene' was the inspiration of a |
| A. | chemist |
| B. | nature |
| C. | dream |
| D. | cloud |
| Answer» D. cloud | |
| 59. |
Chlorobenzene is one of |
| A. | halogens |
| B. | amines |
| C. | Halogenoarenes |
| D. | hydrocarbons |
| Answer» D. hydrocarbons | |
| 60. |
Organic compounds which contain one more than one benzene rings are termed as |
| A. | arenes |
| B. | aryls |
| C. | acyls |
| D. | benzenes |
| Answer» B. aryls | |
| 61. |
The formula of benzene is |
| A. | C₆H₆ |
| B. | C₂H₆ |
| C. | C₆H₁₂ |
| D. | CH |
| Answer» B. C₂H₆ | |
| 62. |
Vanillin is found in seed pods of |
| A. | vanilla orchid |
| B. | rose |
| C. | vanilla tree |
| D. | vanilla roots |
| Answer» B. rose | |
| 63. |
The number of sigma bonds in benzene is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 64. |
Hydrochloric Acid (HCl) and Silver Nitrate (AgNO₃) react to form |
| A. | AgCl + HNO₃ |
| B. | HNO₃ + Ag(Aq) |
| C. | Ag (s) + H₂O + N₂ |
| D. | Hydrogen gas is bubbled off |
| Answer» B. HNO₃ + Ag(Aq) | |
| 65. |
Relative molecular mass of Sulfuric Acid (H₂SO₄) is |
| A. | 98 |
| B. | 58 |
| C. | 108 |
| D. | 120 |
| Answer» B. 58 | |
| 66. |
Phosphorus can have a valency of |
| A. | 2 or 4 |
| B. | 4 or 6 |
| C. | 3 or 5 |
| D. | 2 or 1 |
| Answer» D. 2 or 1 | |
| 67. |
To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of H₂O molecules produced will be |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 68. |
Two Greek words 'element' and 'measure' constitutes the word |
| A. | spectrometry |
| B. | stoichiometry |
| C. | elemetry |
| D. | geometry |
| Answer» C. elemetry | |
| 69. |
The general formula for alcohols is |
| A. | CₙH₂ₙ |
| B. | CₙH₂ₙ₊₁ |
| C. | CₙH |
| D. | CH₃ |
| Answer» C. CₙH | |
| 70. |
Formula of Nitrogen Trichloride (NCl₃) is |
| A. | NaCl₂ |
| B. | NaCl₃ |
| C. | NCl₃ |
| D. | N₂Cl₃ |
| Answer» D. N₂Cl₃ | |
| 71. |
Formula of calcium hydrogen sulphate is |
| A. | CaHSO₄ |
| B. | Ca(HCO₃)₃ |
| C. | Ca(HSO₄)₃ |
| D. | Ca(HSO₄)₂ |
| Answer» E. | |
| 72. |
Charge on Sulphur can be |
| A. | 2 or 4 |
| B. | 4 or 6 |
| C. | 3 or 5 |
| D. | 2 or 3 |
| Answer» C. 3 or 5 | |
| 73. |
Hydrocarbons are the main source of |
| A. | petrol |
| B. | diesel |
| C. | kerosene |
| D. | all of above |
| Answer» E. | |
| 74. |
State symbols include |
| A. | s |
| B. | l and aq |
| C. | g |
| D. | all of these |
| Answer» E. | |
| 75. |
Symbol Hg stands for |
| A. | helium |
| B. | Hydragyrum |
| C. | hydrogen |
| D. | Natrium |
| Answer» C. hydrogen | |
| 76. |
Valency of Plumbum can be |
| A. | 2 or 4 |
| B. | 4 or 6 |
| C. | 3 or 5 |
| D. | 2 or 3 |
| Answer» B. 4 or 6 | |
| 77. |
In magnesium oxide, magnesium ion requires only one oxygen ion because |
| A. | the valency of oxygen is −1 |
| B. | the valency of Oxygen is −2 |
| C. | the valency of magnesium is +1 |
| D. | the formula of magnesium oxide is 2MgO |
| Answer» C. the valency of magnesium is +1 | |
| 78. |
The organic molecules containing hydroxyl group are called |
| A. | esters |
| B. | alcohols |
| C. | aldehydes |
| D. | ethane |
| Answer» C. aldehydes | |
| 79. |
State symbol indicate the |
| A. | state form |
| B. | the solubility |
| C. | the rigidity |
| D. | the volatility |
| Answer» B. the solubility | |
| 80. |
Chemical formula of Potassium Hydrogen Carbonate |
| A. | KHCO₃ |
| B. | K₂CO₃.H₂O |
| C. | KCO₃ |
| D. | K₂CO₄.H₂O |
| Answer» B. K₂CO₃.H₂O | |
| 81. |
Formula of carbonic acid indicates that |
| A. | for each ion of Carbon, two ions of hydrogen are required |
| B. | for each ion of H, two carbonate ions are required |
| C. | for each carbonate ion, two ions of hydrogen are required |
| D. | for two carbonate ions, three ions of Hydrogen are required |
| Answer» D. for two carbonate ions, three ions of Hydrogen are required | |
| 82. |
The number of electrons (e⁻) which are needed to complete the outer shell of each atom determines formula of |
| A. | covalent compound |
| B. | ionic compound |
| C. | co-ordinate compound |
| D. | metallic compound |
| Answer» B. ionic compound | |
| 83. |
SO₄⁻² is the formula of |
| A. | sulphur |
| B. | sulphate |
| C. | sulphuric acid |
| D. | sulphide |
| Answer» C. sulphuric acid | |
| 84. |
Law of conservation of mass |
| A. | ensures that number of atoms of elements before and after the reaction are same |
| B. | is important for strong Van der Waals' forces |
| C. | is important to increase the volatility of metals |
| D. | is important for melting and boiling points of metals only |
| Answer» B. is important for strong Van der Waals' forces | |
| 85. |
Formula of Copper Hydroxide is |
| A. | Cu(OH)₂ |
| B. | CuHOH |
| C. | CuO₂ |
| D. | CuH₂O |
| Answer» B. CuHOH | |
| 86. |
If Magnesium Carbonate (MgCO₃) reacts with Hydrochloric Acid (HCl), products will involve |
| A. | magnesium chloride |
| B. | carbonic acid |
| C. | hydrogen gas |
| D. | carbon dioxide |
| Answer» D. carbon dioxide | |
| 87. |
In Na₂CO₃.10H₂O, relative formula mass is |
| A. | 158 |
| B. | 186 |
| C. | 286 |
| D. | 288 |
| Answer» D. 288 | |
| 88. |
Chemical composition of a compound |
| A. | is fixed |
| B. | can be obtained through relative molecular mass |
| C. | is variable |
| D. | both a and b |
| Answer» E. | |
| 89. |
Chemical formula of Magnesium Carbonate is |
| A. | MgCO₃. H₂O |
| B. | MgCO₃ |
| C. | Mg₂CO₃ |
| D. | Mg₃CO₃ |
| Answer» C. Mg₂CO₃ | |
| 90. |
Hydrogen Chloride (HCl) is a |
| A. | ionic compound |
| B. | covalent compound |
| C. | metallic compound |
| D. | both a and b |
| Answer» E. | |
| 91. |
The molecules of alcohol have |
| A. | hydrogen bonding |
| B. | dipole forces |
| C. | Van der Waals's forces |
| D. | covalent bonding |
| Answer» B. dipole forces | |
| 92. |
In Na₂CO₃.10H₂O, percentage of sodium is |
| A. | 0.1678 |
| B. | 0.1608 |
| C. | 0.1659 |
| D. | 0.1684 |
| Answer» C. 0.1659 | |
| 93. |
In 10H₂O, total units of water molecules are |
| A. | 130 |
| B. | 150 |
| C. | 180 |
| D. | 220 |
| Answer» D. 220 | |
| 94. |
Chemical formula of Sodium Sulfite is |
| A. | Na₂SO₃ |
| B. | Na(SO₄)₂ |
| C. | Na₂CO₃.10H₂O |
| D. | NaH₂PO₄.H₂O |
| Answer» B. Na(SO₄)₂ | |
| 95. |
Valency of magnesium is |
| A. | +1 |
| B. | +2 |
| C. | -1 |
| D. | -2 |
| Answer» C. -1 | |
| 96. |
Relative atomic mass of 3O₃ is |
| A. | 48 |
| B. | 140 |
| C. | 180 |
| D. | 320 |
| Answer» D. 320 | |
| 97. |
MgCO₃ + HCl reacts to form carbonic acid, which decomposes into |
| A. | water |
| B. | CO₂ |
| C. | gases |
| D. | both a and b |
| Answer» D. both a and b | |
| 98. |
When hydroxyl group is attached to carbon atom bonded to two other carbon atoms, the alcohol formed is |
| A. | primary alcohol |
| B. | secondary alcohol |
| C. | tertiary alcohol |
| D. | quaternary alcohol |
| Answer» C. tertiary alcohol | |
| 99. |
Molar mass of Copper Oxide (Cu₂O) is |
| A. | 113.14g/mol |
| B. | 139.33g/mol |
| C. | 173.298g/mol |
| D. | 143.09g/mol |
| Answer» E. | |
| 100. |
Copper can have a charge of |
| A. | 2 or 4 |
| B. | 4 or 6 |
| C. | 3 or 5 |
| D. | 2 or 1 |
| Answer» E. | |