Free Rate of Reaction MCQs with Answers
30 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 measures the change in concentration of a reactant or product per unit time. Questions connect rate with concentration, temperature, pressure, surface area, catalysts and nature of reactants, and may involve rate laws, reaction order, activation energy and collision theory. Rate describes speed, whereas equilibrium describes the final balance of opposing reactions.
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30 questions · page 2 of 2
- A. No units
- B. Unit of moles/dm3
- C. Unit of moles/litre
- D. Unit of moles/dm3s-1
Explanation: The formula for the rate of reaction is concentration/time. Unit for concentration is mol/dm3 and the unit for time is s.
Correct answer: Unit of moles/dm3s-1- A. Mole/ litre
- B. Moles/ gram
- C. Moles/ Second
- D. moles/dm3 s-1
Explanation: Reaction rates are usually expressed as the concentration of reactant consumed or the concentration of product formed per unit time.
Correct answer: moles/dm3 s-1- A. Reaction time
- B. Reaction Speed
- C. Rate of reaction
- D. All of these
Explanation: Correct option is C. The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional…
Correct answer: Rate of reaction- A. Temperature
- B. Pressure
- C. Time
- D. None of these options are correct
Explanation: dx/dt is the rate of change of concentration with respect to time. It is a mathematical expression that represents the change in the…
Correct answer: Time- A. At equilibrium
- B. One instant
- C. Given temperature
- D. Given pressure
Explanation: As the name indicates, the instantaneous rate of a reaction is the rate of the reaction at any instant. So option B is the correct option.
Correct answer: One instant- 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 C27. 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. 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. 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