Free Reaction Kinetics MCQs with Answers
573 Reaction Kinetics 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 kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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573 questions · page 29 of 29
- A. Rate of reaction
- B. Pressure
- C. Conditions
- D. Both A and C
Explanation: Chemical equations tell about the pressure through the number of moles but not the "rate of reaction" and the "conditions of the reaction"…
Correct answer: Both A and C562. If a graph is plotted with concentration data of a reactant in a chemical reaction the curve is_.
- A. Rising
- B. Falling
- C. U shaped
- D. None of these
Explanation: The concentration of reactant decreases with respect to time so the curve in the concentration-time graph should be "falling".
Correct answer: Falling- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The activation energy is the lowest in Option C, hence it would be the most rapid reaction among the other options.
Correct answer: Option C- A. Fractional Order
- B. Pseudo First Order
- C. First Order
- D. Second Order
Explanation: Explanation:The reaction is pseudo first order. Water is in excess as it is the solvent as a result will not affect the reaction order.
Correct answer: Pseudo First Order- A. Concentration of the product
- B. Concentration of the reactant
- C. Temperature of the reaction
- D. Surface area of the product
Explanation: In zero-order reactions, the rate is independent of the concentration of the reactants.
Correct answer: Concentration of the reactant- A. Dilatometric
- B. Refractometric
- C. Optical rotation
- D. Electrical conductivity
Explanation: A is incorrect as a dilatometer is a scientific instrument that measures volume changes caused by a physical or chemical process.B is…
Correct answer: Electrical conductivity- A. Forward activation energy < reverse activation energy
- B. Forward activation energy = reverse activation energy
- C. Forward activation energy > reverse activation energy
- D. No change
Explanation: In an endothermic reaction, the forward reaction generally requires more energy than the reverse reaction.
Correct answer: Forward activation energy > reverse activation energy- 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 reactant- A. Bimolecular
- B. Unimolecular
- C. Trimolecular
- D. Tetramolecular
Explanation: The molecularity of a reaction is defined as the number of reacting molecules that collide simultaneously to bring about a chemical…
Correct answer: Bimolecular- A. Sec
- B. Sec-¹
- C. Mol dm-³sec-¹
- D. None of the above
Explanation: Because the units of the reaction rate are always moles per liter per second, the units of a first-order rate constant are reciprocal…
Correct answer: Sec-¹- A. Conductometry
- B. Polarimetry
- C. pH meter
- D. Volumetric analysis
Explanation: Volumetric analysis is specifically designed to measure concentration changes in a reaction over time, making it ideal for determining…
Correct answer: Volumetric analysis- A. Number of fruitful collisions per second
- B. Number or molecules taking part In a chemical reaction
- C. Number of total collisions per second
- D. All of the above
Explanation: The rate of a chemical reaction depends on the number of molecules or collisions taking part.
Correct answer: All of the above