Free Factors Affecting Rate of Reaction MCQs with Answers
18 Factors Affecting Rate of Reaction MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Reaction rate depends on the nature and concentration of reactants, pressure for gases, temperature, surface area and catalysts. Collision theory explains these effects through collision frequency, orientation and activation energy, while questions often distinguish a catalyst's effect on reaction rate from its lack of effect on equilibrium composition.
Last updated
18 questions
- A. Raising the temperature
- B. Powdering the solid
- C. Increasing the volume of solvent without adding more solute
- D. Adding a suitable catalyst
Explanation: Adding solvent alone dilutes the solution, so the concentration of the reacting species falls and collisions become less frequent, which…
Correct answer: Increasing the volume of solvent without adding more solute- A. the activation energy of the reaction falls
- B. the concentration of the reactants increases
- C. the molecules become larger
- D. a much larger fraction of molecules acquire energy equal to or above the activation energy
Explanation: The Maxwell Boltzmann distribution shifts to the right on heating, and because the activation energy lies out in the tail of the curve…
Correct answer: a much larger fraction of molecules acquire energy equal to or above the activation energy- A. increasing the kinetic energy of the reacting molecules
- B. raising the temperature of the reaction mixture
- C. providing an alternative pathway with a lower activation energy
- D. increasing the concentration of the reactants
Explanation: By offering a route with a smaller energy barrier, a catalyst allows a far larger proportion of collisions to be effective at the same…
Correct answer: providing an alternative pathway with a lower activation energy- A. concentration of the solid
- B. temperature of the mixture
- C. activation energy
- D. surface area available for collisions
Explanation: A reaction between a solid and a fluid can only occur at the exposed surface, so grinding the solid exposes far more particles and the…
Correct answer: surface area available for collisions- A. It remains chemically unchanged at the end of the reaction
- B. It is needed only in a small amount
- C. It shifts the equilibrium towards the products
- D. It lowers the activation energy of both the forward and reverse reactions
Explanation: Because a catalyst lowers the barrier equally in both directions, the two rates rise by the same factor and the equilibrium position and…
Correct answer: It shifts the equilibrium towards the products- A. auto catalysis
- B. Self catalysis
- C. inhibition
- D. Enzyme catalysis
Explanation: Negative catalysis decreases the rate of a reaction and is therefore called inhibition.
Correct answer: inhibition- A. Self catalytic reaction
- B. Enzyme catalytic reaction
- C. Autocatalytic reaction
- D. induced catalysis
Explanation: Nitroglycerine decomposition produces acidic substances that promote further decomposition, so the reaction accelerates through one of its…
Correct answer: Autocatalytic reaction- A. Products
- B. Chemical equilibrium
- C. Reactants
- D. both A & B Chemistry
Explanation: A catalyst changes the rates of the forward and reverse reactions but does not change the final equilibrium composition or the nature of…
Correct answer: both A & B Chemistry- A. Specificity
- B. Special structure
- C. Its own Ea
- D. all of above
Explanation: A catalyst has a particular structure and active surface, so it is selective or specific toward certain reactions, and it provides its own…
Correct answer: all of above- A. The activation energy of the reaction increases
- B. Concentration of the reacting molecules increases
- C. Collision frequency increases
- D. None of these
Explanation: Heating gives reacting molecules more kinetic energy, so they collide more frequently and a greater fraction of collisions has enough…
Correct answer: Collision frequency increases- A. Double decomposition reaction
- B. Neutralization reaction
- C. Ionic reactions
- D. all of above
Explanation: Ionic reactions in aqueous solution are usually very rapid because oppositely charged ions react directly without breaking strong covalent…
Correct answer: all of above- A. Increasing the activation energy
- B. Decreasing the activation energy
- C. Increasing effective collisions
- D. Combining with reactant molecules
Explanation: The explanation for this question will be added soon.
Correct answer: Combining with reactant molecules- A. Temperature
- B. Concentration
- C. Pressure
- D. Rate constant
- E. All of the above
Explanation: The rate of reaction depends on the concentration of reactants, temperature, pressure (in case of gaseous reactants), and catalyst.
Correct answer: All of the above- A. Concentration of reactants does not affect the rate of a reaction
- B. Surface area of reactants affects rate of reaction
- C. Concentration affects rate of reaction
- D. Catalyst affects rate of a reaction
Explanation: The rate constant which is the proportionality constant that relates the rate of reaction with the concentrations of the reactants is not…
Correct answer: Concentration of reactants does not affect the rate of a reaction- A. Temperature
- B. Pressure
- C. Concentration
- D. Catalyst
Explanation: Explanation for this question will be added soon.
Correct answer: Catalyst- A. Double
- B. Three times
- C. Four times
- D. Five times
Explanation: Explanation for this question will be added soon.
Correct answer: Double- A. Nitrous oxide
- B. Carbon oxide
- C. Arsenic oxide
- D. Nitrogen oxide
Explanation: In the contact process, the catalyst used is typically a combination of vanadium(V) oxide (V2O5) or platinum (Pt) supported on a substrate…
Correct answer: Arsenic oxide- A. The reaction is exothermic and the heat generated speeds up the reaction
- B. The hydrogen liberated during the reaction acts as a catalyst
- C. The protective oxide layer of the aluminum dissolves and the meal surface is exposed to the reactant
- D. Sodium aluminate is highly soluble; therefore, it helps the reaction move in the forward direction
Explanation: Aluminium has a protective coat, due to which it initially reacts slowly.
Correct answer: The protective oxide layer of the aluminum dissolves and the meal surface is exposed to the reactantFactors Affecting Rate of Reaction MCQs: common questions
Are these Factors Affecting Rate of Reaction MCQs free?
Yes. All Factors Affecting Rate of Reaction MCQs from Chemistry are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.
How many Factors Affecting Rate of Reaction MCQs are on this page?
There are 18 Factors Affecting Rate of Reaction MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Factors Affecting Rate of Reaction MCQ have an explanation?
Yes. Each Factors Affecting Rate of Reaction question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Factors Affecting Rate of Reaction test?
Yes. The practice button on this page starts a free Factors Affecting Rate of Reaction test drawn from the Chemistry bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.