MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 265 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
According to collision theory, increase in temperature increases |
| A. | kinetic energy of reactants |
| B. | heat energy of reactants |
| C. | both a and b |
| D. | humidity in the air |
| Answer» D. humidity in the air | |
| 152. |
Flour mills and coal mines need to be well ventilated because |
| A. | the surface area of coal and flour needs to be digged out |
| B. | coal and flour particles are scattered in the form of lumps |
| C. | coal and flour particles are scattered in the form of powder |
| D. | coal and flour particles can get ignited very easily |
| Answer» E. | |
| 153. |
Uses of enzymes does not include |
| A. | production of insulin |
| B. | production of cancer drugs |
| C. | drug to combat plague |
| D. | drug to fight dwarfism |
| Answer» D. drug to fight dwarfism | |
| 154. |
Biological catalyst to convert Hydrogen Peroxide (H₂O₂) into water (H₂O) and oxygen (O₂) is |
| A. | amylase |
| B. | hydrolase |
| C. | catalase |
| D. | protease |
| Answer» D. protease | |
| 155. |
If heated Mg(s) is allowed to react with H₂O(l), the product formed other than H₂(g) will be |
| A. | MgO(s) |
| B. | MgO(aq) |
| C. | Mg(OH)₂ (aq) |
| D. | Mg₂O₃(s) |
| Answer» B. MgO(aq) | |
| 156. |
Measurement of increase in concentration of reactant and increase in concentration of product over a specific time period is called |
| A. | rate of reaction |
| B. | equilibrium reaction |
| C. | rate determining step |
| D. | none of above |
| Answer» B. equilibrium reaction | |
| 157. |
Rate of reaction approx. doubles when temperature increases |
| A. | approx. 50C |
| B. | approx. 10 °C |
| C. | approx. 15 °C |
| D. | approx. 20 °C |
| Answer» C. approx. 15 °C | |
| 158. |
Surface area is greater in |
| A. | small particles |
| B. | powdered particles |
| C. | larger lumps |
| D. | crystals |
| Answer» C. larger lumps | |
| 159. |
Factors affecting speed of chemical reactions does not include |
| A. | pressure on reactants |
| B. | particle size of reactants |
| C. | concentration of reactants |
| D. | volume of reactants |
| Answer» E. | |
| 160. |
MSG (Monosodium glutamate) is added in food |
| A. | as a preservative |
| B. | as a food flavourer |
| C. | to enable quick cooking when consumed |
| D. | to add scent |
| Answer» C. to enable quick cooking when consumed | |
| 161. |
In graph of decrease in mass against time, fastest reaction shows |
| A. | steepest curve |
| B. | less steep |
| C. | flat curve |
| D. | a plateau |
| Answer» B. less steep | |
| 162. |
Brazil has fewer oil reserves that's why they can grow a lot of sugar cane to produce |
| A. | alcohol |
| B. | ethanol |
| C. | glucose |
| D. | sugar |
| Answer» C. glucose | |
| 163. |
Which is incorrect about the characteristics of Group II elements? |
| A. | The metals act as reducing agents. |
| B. | The metals are reduced when they react. |
| C. | The metals of Group II loose electrons |
| D. | The metals of Group II are reactive metals |
| Answer» C. The metals of Group II loose electrons | |
| 164. |
Sugar cubes dissolve more slowly in hot drink than granulated sugar because |
| A. | surface area of sugar cubes is less |
| B. | surface area of granulated sugar is more |
| C. | sugar cubes are acidic |
| D. | both a and b |
| Answer» E. | |
| 165. |
The activation energy of particular reaction is the minimum energy that is must for |
| A. | reaction |
| B. | collision |
| C. | absorption |
| D. | reduction |
| Answer» C. absorption | |
| 166. |
Adsorption refers to the |
| A. | bounding of a substance to the surface of another substance |
| B. | diffusion of one substance to the bulk of other substances completely |
| C. | boiling of liquid at the surface |
| D. | an inability to bond something at the surface |
| Answer» B. diffusion of one substance to the bulk of other substances completely | |
| 167. |
Carbonyl compounds when oxidized easily to form carboxylic group involves |
| A. | aldehydes |
| B. | ketones |
| C. | haloalkanes |
| D. | esters |
| Answer» B. ketones | |
| 168. |
Which statement is correct about Group-II metals who have attraction of high nuclear charge? |
| A. | it is because of the greater shielding effect |
| B. | it makes the loss of electrons impossible |
| C. | it is because of the distance from the nucleus |
| D. | it outweighs the attraction of higher nuclear charge |
| Answer» E. | |
| 169. |
The standard enthalpy change of combustion occurs when 1 mol of substance is burnt more than |
| A. | nitrogen |
| B. | oxygen |
| C. | carbon dioxide |
| D. | helium |
| Answer» C. carbon dioxide | |
| 170. |
The electronegativity of Chlorine (Cl₂) is |
| A. | 3.04 |
| B. | 3.16 |
| C. | 2.2 |
| D. | 2.55 |
| Answer» C. 2.2 | |
| 171. |
In a certain volume, higher temperature |
| A. | increases concentration of gases |
| B. | decreases concentration of gases |
| C. | liquefies the gases |
| D. | the reaction may not occur at all |
| Answer» B. decreases concentration of gases | |
| 172. |
Halogen with the highest electronegativity is |
| A. | F |
| B. | Br |
| C. | Cl |
| D. | I |
| Answer» B. Br | |
| 173. |
Collision theory helps to explain the effects of |
| A. | concentration |
| B. | temperature |
| C. | surface area |
| D. | all of above |
| Answer» E. | |
| 174. |
The proportion of successful collision increase with the increase in |
| A. | solute |
| B. | solvent |
| C. | reactant |
| D. | temperature |
| Answer» E. | |
| 175. |
The rate of reaction is the change in the number of reactants or products in specific |
| A. | volume |
| B. | density |
| C. | time |
| D. | area |
| Answer» D. area | |
| 176. |
First calculations on equilibrium were carried out by |
| A. | Cato Guldberg only |
| B. | Peter Waage only |
| C. | John Dalton |
| D. | Cato Guldberg and Peter Waage |
| Answer» E. | |
| 177. |
The distribution of energy for temperature was given in |
| A. | Boltzmann distribution |
| B. | Boltzmann energy |
| C. | Boltzmann temperature distribution |
| D. | Boltzmann pressure |
| Answer» B. Boltzmann energy | |
| 178. |
According to collision theory, the reaction speeds up when a frequency of reaction |
| A. | decreases |
| B. | increases |
| C. | constant |
| D. | equilibrium |
| Answer» C. constant | |
| 179. |
The standard enthalpy change of neutralization involves the reaction of an acid with an alkali to form 1 mol of |
| A. | water |
| B. | oxygen |
| C. | nitrogen |
| D. | anhydrous salt |
| Answer» B. oxygen | |
| 180. |
The slowest step on which overall reaction depends is |
| A. | rate of reaction |
| B. | rate equation |
| C. | rate determining step |
| D. | none of above |
| Answer» D. none of above | |
| 181. |
Many catalysts are |
| A. | noble gases |
| B. | transition metals |
| C. | non-metals |
| D. | inert gases |
| Answer» C. non-metals | |
| 182. |
If forward reaction is feasible then the reverse mechanism is |
| A. | not feasible |
| B. | possible |
| C. | constant |
| D. | highly probable |
| Answer» B. possible | |
| 183. |
The pH of Mg(OH)₂ produced after Mg(s) and H₂O(l) reaction is |
| A. | 1 to 4 |
| B. | 5 to 7 |
| C. | 8 to 11 |
| D. | 12 to 14 |
| Answer» D. 12 to 14 | |
| 184. |
Some particles collide but bounce back afterward it is called |
| A. | successful collision |
| B. | unsuccessful collision |
| C. | successful reaction |
| D. | unsuccessful reaction |
| Answer» C. successful reaction | |
| 185. |
An average size cigarette burns in 10 seconds |
| A. | in pure hydrogen |
| B. | in pure oxygen |
| C. | in pure carbon dioxide |
| D. | at room temperature |
| Answer» C. in pure carbon dioxide | |
| 186. |
The enthalpy change when the number of reactants gives products under standard conditions is called standard enthalpy change of |
| A. | reaction |
| B. | formation |
| C. | combustion |
| D. | neutralization |
| Answer» B. formation | |
| 187. |
The value of Eo is known as |
| A. | standard electrode potential |
| B. | standard cell potential |
| C. | standard charge potential |
| D. | standard ion potential |
| Answer» C. standard charge potential | |
| 188. |
Order of reaction can be predicted by knowing that the rate-determining step have what |
| A. | intermediates |
| B. | reactants |
| C. | products |
| D. | initiators |
| Answer» B. reactants | |
| 189. |
Nitric acid is a good |
| A. | oxidizing agent |
| B. | reducing agent |
| C. | reactant |
| D. | none of above |
| Answer» B. reducing agent | |
| 190. |
Among zinc and copper, the greater tendency to lose electrons is of |
| A. | copper |
| B. | zinc |
| C. | aluminum |
| D. | nickel |
| Answer» C. aluminum | |
| 191. |
If the reaction is likely to occur when we say that it is |
| A. | feasible |
| B. | impossible |
| C. | constant |
| D. | malleable |
| Answer» B. impossible | |
| 192. |
Upon reaction of metals of Group II with oxygen, electrons are lost more easily by |
| A. | larger atoms of Group-II |
| B. | smaller atoms of Group-II |
| C. | larger atoms of Group-III |
| D. | smaller atoms of Group-III |
| Answer» B. smaller atoms of Group-II | |
| 193. |
A colorimeter helps to measure in a reaction mixture its |
| A. | progress |
| B. | reactants |
| C. | products |
| D. | temperature |
| Answer» B. reactants | |
| 194. |
What is true about Carbon dioxide? |
| A. | it enhances global warming only |
| B. | it is pollutant only |
| C. | it is toxic |
| D. | it enhances global warming and it is pollutant |
| Answer» E. | |
| 195. |
The system will not be in equilibrium when there is an increase in concentration of |
| A. | reactants |
| B. | products |
| C. | catalysts |
| D. | activation energy |
| Answer» C. catalysts | |
| 196. |
Consider the reaction: Al(s) + O₂ (g) → Al₂O₃. Moles of Al(s) needed to balance the equation are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 197. |
A saturated solution of lead (II) contains 0.99g per 100 g of water, therefore it is regarded as |
| A. | saturated solution |
| B. | unsaturated solution |
| C. | insoluble |
| D. | soluble |
| Answer» D. soluble | |
| 198. |
The problem of enhanced global warming is due to the vast amount of CO₂ produced by a human from past |
| A. | 100 years |
| B. | 200 years |
| C. | 300 years |
| D. | 400 years |
| Answer» C. 300 years | |
| 199. |
The condition of Mg in which it reacts violently with water is |
| A. | Mg(s) while cold |
| B. | Mg(s) when heated |
| C. | Mg(s) at normal temperature |
| D. | none of above |
| Answer» C. Mg(s) at normal temperature | |
| 200. |
Upon the reaction: SiCl₄(l) + 2H₂O(l) → SiO₂(s) + HCl(g), the solution becomes ionic because |
| A. | H⁺ are produced. |
| B. | the gaseous HCl is formed |
| C. | some of the HCl(g) can get dissolved in water |
| D. | all of above |
| Answer» E. | |