MCQOPTIONS
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MCQOPTIONS
This section includes 376 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Acid rain falls in streams, rivers, lakes and makes them |
| A. | clean |
| B. | pollute |
| C. | acidic |
| D. | none of above |
| Answer» D. none of above | |
| 52. |
The monomer which is used to make Poly Vinyl Chloride (PVC) is called |
| A. | chloroethene |
| B. | chloromethane |
| C. | chloropropane |
| D. | chlorobutane |
| Answer» B. chloromethane | |
| 53. |
Recycling helps us by |
| A. | saving energy |
| B. | conserving ores |
| C. | cheaper than extracting |
| D. | all of above |
| Answer» E. | |
| 54. |
Down the group II, thermal decomposition gradually |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | constant |
| Answer» B. decreases | |
| 55. |
The raw material for PLA is |
| A. | starch |
| B. | glucose |
| C. | oil |
| D. | sucrose |
| Answer» B. glucose | |
| 56. |
In Group-IV, melting point decreases |
| A. | down the group |
| B. | across the period (left to right) |
| C. | across the period (right to left) |
| D. | up the group |
| Answer» B. across the period (left to right) | |
| 57. |
Halogens react with hydrogen gas to form |
| A. | hydrogen halides |
| B. | hyoxl |
| C. | hydrochloric acid |
| D. | none of above |
| Answer» B. hyoxl | |
| 58. |
In Group-IV, an increase in temperature may cause |
| A. | increase in the conductivity of metals |
| B. | decrease in the conductivity of metals |
| C. | conductivity does not change |
| D. | variation in conductivity depending on pressure |
| Answer» C. conductivity does not change | |
| 59. |
After the Be, an element that has the highest melting point in Group-II is |
| A. | Mg |
| B. | Ca |
| C. | Sr |
| D. | Ba |
| Answer» C. Sr | |
| 60. |
The highly reactive element which can burn glass, metals, and water in a stream of gas is even when cold is |
| A. | iodine (I₂) |
| B. | fluorine (F₂) |
| C. | chlorine (Cl₂) |
| D. | bromine (Br₂) |
| Answer» C. chlorine (Cl₂) | |
| 61. |
Depleting of CFCs caused a serious environmental hazard i.e. |
| A. | ozone layer |
| B. | ultra violet rays |
| C. | stratosphere |
| D. | exosphere |
| Answer» B. ultra violet rays | |
| 62. |
Every atom of silicon (Si) is held together in a silicon molecule with strong |
| A. | covalent bond |
| B. | ionic bond |
| C. | co-ordinate bond |
| D. | dative bond |
| Answer» B. ionic bond | |
| 63. |
In metalloids of Group IV, the electrical conductivity increases with |
| A. | increase in temperature |
| B. | decrease in temperature |
| C. | remains constant |
| D. | variation in pressure |
| Answer» B. decrease in temperature | |
| 64. |
The color of Iodine (I₂) is |
| A. | grey |
| B. | black (s) |
| C. | purple (vapors) |
| D. | all of above |
| Answer» E. | |
| 65. |
Going down the group, there is an increase in |
| A. | melting point only |
| B. | boiling point only |
| C. | oxidation state |
| D. | melting and boiling point |
| Answer» E. | |
| 66. |
On heating, lead(II) oxide (PbO) will produce |
| A. | red lead oxide |
| B. | Pb3O₄ |
| C. | triplumbic tetroxide |
| D. | all of above |
| Answer» E. | |
| 67. |
The calcium oxide reacts with water readily to make a solution which is weakly |
| A. | acidic |
| B. | basic |
| C. | alkaline |
| D. | neutral |
| Answer» D. neutral | |
| 68. |
In flares production, mostly the fine powder used is of |
| A. | silicon |
| B. | sulfur |
| C. | magnesium |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 69. |
When a Group II nitrate is heated, toxic NO₂ can be seen as |
| A. | black fumes |
| B. | brown fumes |
| C. | blue fumes |
| D. | white fumes |
| Answer» C. blue fumes | |
| 70. |
As the metallic radii increases in Group II, the density |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | depends upon the elements it reacts with |
| Answer» B. decreases | |
| 71. |
Chlorine water added to sodium bromide will change its color to |
| A. | blue |
| B. | yellowish brown |
| C. | purple |
| D. | white |
| Answer» C. purple | |
| 72. |
The electronegativity of Sodium is |
| A. | 2.55 |
| B. | 0.93 |
| C. | 3.44 |
| D. | 3.04 |
| Answer» C. 3.44 | |
| 73. |
Rocks of the building are made by blocks using mortar with the element |
| A. | carbon |
| B. | limestone |
| C. | silicon |
| D. | sulfur |
| Answer» C. silicon | |
| 74. |
Compounds which contain Cl⁻, Br⁻, and I⁻ will always react with |
| A. | nitric acid |
| B. | silver nitrate |
| C. | sulfuric acid |
| D. | hydrochloric acid |
| Answer» D. hydrochloric acid | |
| 75. |
The electronegativity of Silicon is |
| A. | 2.2 |
| B. | 3.16 |
| C. | 1.9 |
| D. | 2.55 |
| Answer» D. 2.55 | |
| 76. |
Introducing a halogen atom into an alkene can greatly reduce its |
| A. | polarity |
| B. | volatility |
| C. | flammability |
| D. | reactivity |
| Answer» D. reactivity | |
| 77. |
Under standard conditions common metallic form of tin is |
| A. | grey tin |
| B. | white tin |
| C. | black tin |
| D. | silver tin |
| Answer» C. black tin | |
| 78. |
All nylons are made by reactions amine group and |
| A. | carboxylic acids only |
| B. | acyl-chloride group only |
| C. | alkyls |
| D. | carboxylic acids and acyl-chloride group |
| Answer» E. | |
| 79. |
What is correct about group IV tetrachlorides? |
| A. | they have high boiling points |
| B. | they have low boiling points |
| C. | they cannot hydrolysed by water |
| D. | none of above |
| Answer» C. they cannot hydrolysed by water | |
| 80. |
Down the group, the melting points of Halogens |
| A. | increase |
| B. | decrease |
| C. | remain steady |
| D. | varies depending on their surroundings |
| Answer» B. decrease | |
| 81. |
Using more than one type of unsaturated monomer will produce a |
| A. | co-polymer |
| B. | polyamides |
| C. | polyesters |
| D. | polytone |
| Answer» B. polyamides | |
| 82. |
Oxides formed by group IV have an oxidation state |
| A. | 2 only |
| B. | 4 only |
| C. | 1 |
| D. | 2 and 4 |
| Answer» E. | |
| 83. |
Polyester made by on single type of monomer, lactic acid (C₃H₆O₃) is called |
| A. | PLA |
| B. | nylon |
| C. | caprolactum |
| D. | fiber |
| Answer» B. nylon | |
| 84. |
The carbonyl compounds have an odor similar to |
| A. | almonds |
| B. | grapes |
| C. | fruits |
| D. | blue cheese |
| Answer» B. grapes | |
| 85. |
Excess acids in the stomach can be neutralized through |
| A. | Ca(OH)₂ |
| B. | Mg(OH)₂ |
| C. | MgO |
| D. | CaO |
| Answer» D. CaO | |
| 86. |
Strontium (Sr) compounds put on a nichrome (NiCr) wire and heated gives of color |
| A. | brick red |
| B. | scarlet red |
| C. | apple green |
| D. | blue |
| Answer» C. apple green | |
| 87. |
CFCs stands for |
| A. | chlorofluorocarbons |
| B. | chloratefluratecarbons |
| C. | chloridefluoridecarbons |
| D. | chloroflourocarbonates |
| Answer» B. chloratefluratecarbons | |
| 88. |
Compound that has the oxidation state of +2 is |
| A. | Tin(II) oxide SnO |
| B. | Tin(IV) oxide SnO₂ |
| C. | Lead(IV)oxide PbO₂ |
| D. | Carbon dioxide CO₂ |
| Answer» B. Tin(IV) oxide SnO₂ | |
| 89. |
The lowest melting point among the four elements given below is of |
| A. | Calcium (Ca) |
| B. | Strontium (Sr) |
| C. | Beryllium (Be) |
| D. | Barium (Ba) |
| Answer» E. | |
| 90. |
The barium metal is highly reactive if it is stored in |
| A. | gas |
| B. | oil |
| C. | water |
| D. | petrol |
| Answer» C. water | |
| 91. |
The halogens get less reactive |
| A. | across the periods |
| B. | down the groups |
| C. | f-block |
| D. | d-block |
| Answer» C. f-block | |
| 92. |
Benzene-1,4-dicarboxylic acid and ethan-1,2 diol react together to make |
| A. | polyester only |
| B. | Terylene only |
| C. | Nylon |
| D. | polyester and Terylene |
| Answer» E. | |
| 93. |
The elements present in right of silicon are |
| A. | smaller in size only |
| B. | non-metallic only |
| C. | metallic |
| D. | smaller in size and non-metallic |
| Answer» E. | |
| 94. |
All tetrachlorides are hydrolyzed by water except |
| A. | CCl₄ |
| B. | SiCl₄ |
| C. | SnCl₄ |
| D. | PbCl₄ |
| Answer» B. SiCl₄ | |
| 95. |
Six carbon atoms in a hexagon and attached further with the hydrogen atom is the molecule of |
| A. | benzene |
| B. | oxygen |
| C. | propane |
| D. | ethene |
| Answer» B. oxygen | |
| 96. |
Greater number of electrons (e⁻) in halogens (F₂, Cl₂, Br₂, I₂) are indicative of |
| A. | greater van der Waal's forces only |
| B. | least volatility only |
| C. | highest volatility |
| D. | greater van der Waal's forces and least volatility |
| Answer» E. | |
| 97. |
Across the period, atomic radius |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | constant |
| Answer» C. remains same | |
| 98. |
Silicon is classified as |
| A. | semi-metal only |
| B. | metalloid only |
| C. | non-metals |
| D. | semi-metal and metalloid |
| Answer» E. | |
| 99. |
The first law of thermodynamics states that energy can not be |
| A. | created only |
| B. | destroyed only |
| C. | converted |
| D. | created and destroyed |
| Answer» E. | |
| 100. |
Iron (Fe) metal in the form of steel (mixture of iron and carbon) can even be corroded by |
| A. | acid rain |
| B. | aerosols |
| C. | rain |
| D. | pollution |
| Answer» B. aerosols | |