MCQOPTIONS
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MCQOPTIONS
This section includes 106 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
When an acid is added to alkali, the product is |
| A. | water |
| B. | hydroxides |
| C. | hydrogen gas |
| D. | salts |
| Answer» E. | |
| 52. |
Chemical substances slowing the rate of chemical reaction is called as |
| A. | concentration |
| B. | pressure |
| C. | inhibitors |
| D. | catalysts |
| Answer» D. catalysts | |
| 53. |
Graphite is a conductor of electricity because |
| A. | it is a non-metal form of Carbon |
| B. | it has valence electrons |
| C. | None of Above |
| D. | Both A and B |
| Answer» E. | |
| 54. |
Basic oxides neutralize |
| A. | acids |
| B. | water |
| C. | hydroxonium ions |
| D. | non-metal oxides |
| Answer» B. water | |
| 55. |
Giant strong macromolecules are formed in |
| A. | simple covalent compounds |
| B. | ionic compounds |
| C. | metallic compounds |
| D. | complex covalent molecules |
| Answer» E. | |
| 56. |
Expression of the ratio of the combining number of atoms or ions is called as |
| A. | exponential notation |
| B. | valency |
| C. | isotopic charges |
| D. | formula |
| Answer» E. | |
| 57. |
While iodide ion oxidizes to iodine, a change in color from colorless to |
| A. | pink occurs |
| B. | brown occurs |
| C. | violet occurs |
| D. | blue occurs |
| Answer» C. violet occurs | |
| 58. |
Fine insoluble solid particles can be removed through |
| A. | decanting |
| B. | crystallization |
| C. | separating funnel |
| D. | centrifuging |
| Answer» E. | |
| 59. |
Apples contain |
| A. | malic acid |
| B. | citric acid |
| C. | acetic acid |
| D. | tartaric acid |
| Answer» B. citric acid | |
| 60. |
Acid become colorless when added with |
| A. | phenolphthalein indicator |
| B. | screened methyl orange indicators |
| C. | universal indicator |
| D. | litmus indicator |
| Answer» B. screened methyl orange indicators | |
| 61. |
If the hydrogen of an acid is fully replaced by a metal, the product is a |
| A. | amphoteric oxides |
| B. | neutral oxides |
| C. | salt |
| D. | acid salt |
| Answer» D. acid salt | |
| 62. |
Acids react with metal oxides to form |
| A. | salt and hydrogen gas |
| B. | salt and water |
| C. | None of Above |
| D. | Both A and B |
| Answer» C. None of Above | |
| 63. |
Insoluble salts can be made by |
| A. | reaction of a metal oxide and an acid |
| B. | reaction of a metal and an acid |
| C. | ionic precipitation |
| D. | reaction of a metal hydroxide and an acid |
| Answer» D. reaction of a metal hydroxide and an acid | |
| 64. |
The element is made up of |
| A. | matter |
| B. | particles |
| C. | atoms |
| D. | isotopes |
| Answer» C. atoms | |
| 65. |
pH value above 7 is |
| A. | alkaline |
| B. | acidic |
| C. | basic |
| D. | neutral |
| Answer» B. acidic | |
| 66. |
In Universal indicators, a pH of 4 to 7 indicates |
| A. | weak acids |
| B. | strong acids |
| C. | strong alkalis |
| D. | weak alkalis |
| Answer» B. strong acids | |
| 67. |
An impure substance |
| A. | increases the boiling point |
| B. | lowers the boiling point |
| C. | increases the melting point |
| D. | lowers the melting point |
| Answer» E. | |
| 68. |
Consider the equation P4O10 + H2O → H3PO4. The reaction produces how many moles of H3PO4? |
| A. | 4 |
| B. | 2 |
| C. | 8 |
| D. | 6 |
| Answer» B. 2 | |
| 69. |
Consider the equation P4O10 + H2O → H3PO4. the reaction requires how many moles of water? |
| A. | 4 |
| B. | 2 |
| C. | 8 |
| D. | 6 |
| Answer» E. | |
| 70. |
Melting and boiling points of ___________ are always above room temperature |
| A. | liquids |
| B. | solids |
| C. | all of these |
| D. | gases |
| Answer» C. all of these | |
| 71. |
What are the products of the given reaction? CO2 + H2O → |
| A. | H3O |
| B. | CO |
| C. | CO2 + OH- |
| D. | H2CO3 |
| Answer» E. | |
| 72. |
Metals are solids except |
| A. | selenium |
| B. | helium |
| C. | Potassium |
| D. | mercury |
| Answer» E. | |
| 73. |
Hydrogen Chloride gas dissolved in Methylbenzene is not acidic because |
| A. | it has ample free hydrogen ions |
| B. | it is ionic in nature |
| C. | it can easily form hydroxonium ions |
| D. | it has no free hydrogen ions |
| Answer» E. | |
| 74. |
The formula of tetra chloromethane is |
| A. | CH4Cl4 |
| B. | CCl4 |
| C. | C4. HCl4 |
| D. | C(HCl)4 |
| Answer» C. C4. HCl4 | |
| 75. |
Condensed solid produced during sublimation is |
| A. | sublimate |
| B. | crystals |
| C. | insoluble |
| D. | residue |
| Answer» B. crystals | |
| 76. |
Non-metals are good at |
| A. | donating electrons |
| B. | accepting electrons |
| C. | Both A and B |
| D. | None of These |
| Answer» C. Both A and B | |
| 77. |
In Universal indicators, red color shows a pH of |
| A. | 1 to 3 |
| B. | 0 to 3 |
| C. | 0 to 7 |
| D. | 1 to 7 |
| Answer» C. 0 to 7 | |
| 78. |
if the reactants are Calcium and Nitric acid, method of salt preparation will be |
| A. | metal Oxide + acid |
| B. | metal + acid |
| C. | metal carbonate and acid |
| D. | metal hydroxide and acid |
| Answer» C. metal carbonate and acid | |
| 79. |
Due to mobile valence electrons, |
| A. | metals are not rigid |
| B. | metals are rigid |
| C. | metals are poor insulators |
| D. | metals are poor electrolytes |
| Answer» B. metals are rigid | |
| 80. |
pH of soils can be controlled through |
| A. | acidic oxides |
| B. | neutralization |
| C. | neutral oxides |
| D. | Amphoteric oxides |
| Answer» C. neutral oxides | |
| 81. |
Carbon-12 is chosen as the standard atom because |
| A. | it is decomposable in nature |
| B. | it is found in most organic compounds |
| C. | Carbon is the most common element |
| D. | the mass of 12 units has been measured very accurately |
| Answer» E. | |
| 82. |
Rate of reaction does not depend upon |
| A. | concentration of reactants |
| B. | temperature |
| C. | theory of expanding gases |
| D. | pressure |
| Answer» D. pressure | |
| 83. |
Acidic oxides do not include |
| A. | SO2 |
| B. | CO2 |
| C. | PbO |
| D. | P2O5 |
| Answer» D. P2O5 | |
| 84. |
Soap is |
| A. | alkaline |
| B. | acidic |
| C. | basic |
| D. | neutral |
| Answer» B. acidic | |
| 85. |
An alkali is a |
| A. | water insoluble base |
| B. | water soluble base |
| C. | oil insoluble base |
| D. | oil soluble base |
| Answer» C. oil insoluble base | |
| 86. |
Bases include |
| A. | metal hydroxides |
| B. | metal oxides |
| C. | None of Above |
| D. | Both A and B |
| Answer» E. | |
| 87. |
No heating is required when to form salts, acids react with |
| A. | metal oxides |
| B. | metal carbonates |
| C. | metal chlorides |
| D. | Metal hydroxides |
| Answer» C. metal chlorides | |
| 88. |
Endothermic changes are indicated through |
| A. | making of chemical bond |
| B. | breaking of chemical bonds |
| C. | all of these |
| D. | burning of carbon |
| Answer» C. all of these | |
| 89. |
Methane is an excellent fuel because |
| A. | it gives off a lot of heat |
| B. | it is basically an endothermic reaction |
| C. | it contains a lot of carbon |
| D. | it produces carbon monoxide |
| Answer» B. it is basically an endothermic reaction | |
| 90. |
Consider the equation PbO + HCl → PbCl2 + H2O. Balancing of the equation requires how many moles of HCl? |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 3 |
| Answer» B. 1 | |
| 91. |
Simple molecules or giant macromolecules are examples of |
| A. | covalent bonds |
| B. | ionic compounds |
| C. | diatic bond |
| D. | metallic bonds |
| Answer» B. ionic compounds | |
| 92. |
The crystallization of microchips does not involve |
| A. | a crystal |
| B. | a solute |
| C. | a soluble |
| D. | a solvent |
| Answer» E. | |
| 93. |
Double covalent bond refers to the sharing of |
| A. | two electrons |
| B. | one electron |
| C. | four electrons |
| D. | three electrons |
| Answer» D. three electrons | |
| 94. |
Dissolving, filtering and evaporating are the methods of |
| A. | purification |
| B. | ice melting |
| C. | change of state |
| D. | diffusion |
| Answer» B. ice melting | |
| 95. |
The formula of nitrogen trichloride is |
| A. | NaCl3 |
| B. | NaCl2 |
| C. | N2Cl3 |
| D. | NCl3 |
| Answer» E. | |
| 96. |
If the hydrogen of an acid is partially replaced by a metal, it forms |
| A. | amphoteric oxides |
| B. | neutral oxides |
| C. | salt |
| D. | acid salt |
| Answer» E. | |
| 97. |
In order to lower the melting point of ice, |
| A. | solar energy shall be waited for |
| B. | hot water shall be poured |
| C. | the ice shall be scrapped from the roads and doorways |
| D. | salt can be spread over the ice |
| Answer» E. | |
| 98. |
Oil is an example of |
| A. | non-electrolyte |
| B. | strong electrolyte |
| C. | week insulator |
| D. | weak electrolyte |
| Answer» B. strong electrolyte | |
| 99. |
K2O + H2O → |
| A. | KOH |
| B. | K(OH)3 |
| C. | KO + H2 + O2 |
| D. | KOH.H2O |
| Answer» B. K(OH)3 | |
| 100. |
Saccharin is |
| A. | alkaline |
| B. | acidic |
| C. | None of Above |
| D. | neutral |
| Answer» C. None of Above | |