Chemical Kinetics

Q. For a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the initial concentration is doubled?
  • A. 10 minutes
  • B. 5 minutes
  • C. 20 minutes
  • D. 15 minutes
Q. For a first-order reaction, the half-life is independent of the initial concentration. What is the expression for half-life?
  • A. t1/2 = 0.693/k
  • B. t1/2 = k/0.693
  • C. t1/2 = 1/k
  • D. t1/2 = k/2
Q. For a first-order reaction, the half-life is independent of which of the following?
  • A. Initial concentration
  • B. Rate constant
  • C. Temperature
  • D. All of the above
Q. For a reaction A → B, if the rate of formation of B is 0.5 mol/L/s, what is the rate of disappearance of A?
  • A. 0.5 mol/L/s
  • B. 1.0 mol/L/s
  • C. 0.25 mol/L/s
  • D. 2.0 mol/L/s
Q. For a reaction A → B, if the rate of reaction doubles when the concentration of A is doubled, what is the order of the reaction with respect to A?
  • A. Zero order
  • B. First order
  • C. Second order
  • D. Third order
Q. For a zero-order reaction, how does the rate change with concentration?
  • A. Increases linearly
  • B. Decreases linearly
  • C. Remains constant
  • D. Increases exponentially
Q. For a zero-order reaction, how does the rate change with respect to concentration?
  • A. Increases linearly
  • B. Decreases linearly
  • C. Remains constant
  • D. Increases exponentially
Q. If the activation energy of a reaction is increased, what happens to the rate constant k?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. If the rate of a reaction doubles when the temperature is increased by 10°C, what is the approximate activation energy (Ea) of the reaction?
  • A. 20 kJ/mol
  • B. 40 kJ/mol
  • C. 60 kJ/mol
  • D. 80 kJ/mol
Q. In a first-order reaction, if the concentration of the reactant is halved, what happens to the half-life?
  • A. It doubles
  • B. It remains the same
  • C. It is halved
  • D. It becomes zero
Q. In a reaction A → B, if the concentration of A decreases from 0.5 M to 0.1 M in 20 minutes, what is the average rate of reaction?
  • A. 0.02 M/min
  • B. 0.04 M/min
  • C. 0.05 M/min
  • D. 0.06 M/min
Q. In a reaction A → B, if the rate of formation of B is 0.1 mol/L·s, what is the rate of disappearance of A?
  • A. 0.1 mol/L·s
  • B. 0.05 mol/L·s
  • C. 0.2 mol/L·s
  • D. 0.1 L/mol·s
Q. In a reaction A → B, if the rate of formation of B is 0.5 mol/L·s, what is the rate of disappearance of A?
  • A. 0.5 mol/L·s
  • B. 1.0 mol/L·s
  • C. 0.25 mol/L·s
  • D. 0.75 mol/L·s
Q. In a reaction mechanism, the slowest step is known as the:
  • A. Rate-determining step
  • B. Intermediate step
  • C. Fast step
  • D. Catalytic step
Q. In a reaction mechanism, the slowest step is known as what?
  • A. Rate-determining step
  • B. Intermediate step
  • C. Fast step
  • D. Catalytic step
Q. In a zero-order reaction, how does the rate change with respect to concentration?
  • A. Increases linearly
  • B. Decreases linearly
  • C. Remains constant
  • D. Increases exponentially
Q. In a zero-order reaction, if the rate constant k is 5 mol/L/s, how long will it take for the concentration to decrease from 2 mol/L to 0 mol/L?
  • A. 0.4 s
  • B. 0.5 s
  • C. 0.6 s
  • D. 0.8 s
Q. In a zero-order reaction, the rate of reaction is independent of which of the following?
  • A. Concentration of reactants
  • B. Temperature
  • C. Catalyst
  • D. All of the above
Q. The Arrhenius equation relates the rate constant to which of the following?
  • A. Temperature and concentration
  • B. Temperature and activation energy
  • C. Concentration and pressure
  • D. Temperature and volume
Q. The half-life of a first-order reaction is dependent on which of the following?
  • A. Initial concentration
  • B. Rate constant
  • C. Temperature
  • D. All of the above
Q. The rate law for a reaction is determined experimentally and is dependent on which of the following?
  • A. Stoichiometry of the reaction
  • B. Mechanism of the reaction
  • C. Equilibrium constant
  • D. Temperature only
Q. The rate law for a reaction is determined experimentally. Which of the following is true?
  • A. It can be derived from stoichiometry
  • B. It is always first-order
  • C. It depends on the mechanism
  • D. It is independent of temperature
Q. The rate law for a reaction is given as rate = k[A][B]². What is the overall order of the reaction?
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Q. The rate of a reaction doubles when the temperature is increased by 10°C. This is an example of which rule?
  • A. Arrhenius equation
  • B. Van 't Hoff rule
  • C. Le Chatelier's principle
  • D. Gibbs free energy
Q. The rate of a reaction is defined as the change in concentration of a reactant or product per unit time. What is the unit of rate?
  • A. mol/L
  • B. mol/L·s
  • C. L/mol·s
  • D. 1/s
Q. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This is known as what?
  • A. Rate law
  • B. Equilibrium constant
  • C. Reaction quotient
  • D. Catalytic law
Q. What effect does increasing the concentration of a reactant have on the rate of a first-order reaction?
  • A. Increases the rate
  • B. Decreases the rate
  • C. No effect
  • D. Rate becomes zero
Q. What is the effect of a catalyst on the equilibrium position of a reversible reaction?
  • A. Shifts the equilibrium to the right
  • B. Shifts the equilibrium to the left
  • C. No effect on equilibrium position
  • D. Increases the equilibrium constant
Q. What is the effect of increasing temperature on the rate of a chemical reaction?
  • A. Decreases the rate
  • B. Increases the rate
  • C. No effect
  • D. Depends on the reaction
Q. What is the effect of increasing the concentration of a reactant in a first-order reaction?
  • A. Rate increases linearly
  • B. Rate decreases
  • C. Rate remains constant
  • D. Rate increases exponentially
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