10-minute Quiz : Chapter 51 Rate equation

Which of the following statements concerning the rate of reaction is correct?

• A. It is constant whatever the temperature is.
• B. It is independent of the area of contact between particles of solid reactants.
• C. It is high for reactions involving only gases due to the high average kinetic energy of gaseous molecules.
• D. It is high for reactions involving oppositely charged ions in aqueous solution because no chemical bonds have to be broken.

Which of the following statements concerning orders of reaction is/are correct?

(1) Orders of reaction must be integers.

(2) Orders of reaction can only be determined through experiments.

(3) Orders of reaction are affected by the stoichiometric coefficients of the reactants in the chemical equation.

• A. (1) only
• B. (2) only
• C. (1) and (3) only
• D. (2) and (3) only

Consider the hydrolysis of ethyl ethanoate in the presence of dilute sulphuric acid at a given temperature. What is the order of reaction with respect to H₂O(l)?

• A. 0
• B. 1
• C. 2
• D. 3

What is the concentration of the reactant in a first order reaction with the reaction rate of 0.60 mol dm⁻³ s⁻¹ and the rate constant of 0.035 s⁻¹?

• A. 0.035 mol dm⁻³
• B. 0.058 mol dm⁻³
• C. 17.1 mol dm⁻³
• D. 19.4 mol dm⁻³

For the reaction ‘3X + Y → X₃Y’, the rate equation is r₁ = k[X]³[Y]. What would be the rate equation when the concentration of X is doubled and that of Y is halved?

• A. 2r₁

• B. 4r₁

• C. 4.5r₁

• D. 5r₁

Given that a zeroth order reaction completes 25% in 30 seconds, what is the time required for completing 50% of the reaction?

• A. 30 s
• B. 40 s
• C. 50 s
• D. 60 s

Consider the reaction between propanone and iodine catalysed by sulphuric acid. Given that the order of reaction with respect to CH₃COCH₃(aq) is 1, which of the curves correctly shows the relationship between rate of reaction and concentration of CH₃COCH₃(aq)?

• A
• B
• C
• D

Which of the following statements concerning pseudo first order reactions are correct?

(1) The rate of reaction depends on the concentration of one reactant only.

(2) The unit of the rate constant can be min⁻¹.

(3) The reaction involves only one kind of reactant.

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Direction: Questions 9 and 10 refer to the kinetics data of the reaction ‘2X + Y₂ → X₂Y₂’.

Which of the following is the rate equation for this reaction?

• A. Rate = k[X][Y₂]

• B. Rate = k[X]²[Y₂]

• C. Rate = k[X][Y₂]²

• D. Rate = k[X]²[Y₂]²

Direction: Questions 9 and 10 refer to the kinetics data of the reaction ‘2X + Y₂ → X₂Y₂’.

What is the initial rate of consumption of X in Trial 1?

• A. 16 mol dm⁻³ s⁻¹
• B. 32 mol dm⁻³ s⁻¹
• C. 64 mol dm⁻³ s⁻¹
• D. 128 mol dm⁻³ s⁻¹