Quiz for Chemical Kinetics

Q1: The study of the speed of chemical reactions is called:

A. Chemical Kinetics B. Chemical Equilibrium C. Thermodynamics D. Electrochemistry

Q2: The rate of a reaction is defined as:

A. Change in concentration per unit time B. Energy change during reaction C. Volume change during reaction D. Mass change during reaction

Q3: For a first-order reaction, the unit of rate constant k is:

A. s⁻¹ B. mol L⁻¹ s⁻¹ C. mol L⁻¹ D. s

Q4: The half-life of a first-order reaction:

A. Is independent of initial concentration B. Depends on initial concentration C. Increases with concentration D. Decreases with concentration

Q5: The rate law expression for the reaction A + B → products is rate = k[A][B]. The order of reaction is:

A. 2 B. 1 C. 0 D. 3

Q6: The Arrhenius equation relates rate constant to:

A. Temperature B. Pressure C. Volume D. Concentration

Q7: The activation energy is the:

A. Minimum energy required for reaction B. Energy released C. Total energy of reactants D. Energy lost during reaction

Q8: If the rate constant doubles with a 10°C rise in temperature, the approximate activation energy is:

A. 50 kJ/mol B. 10 kJ/mol C. 100 kJ/mol D. 5 kJ/mol

Q9: In a zero-order reaction, the concentration vs time graph is:

A. Linear with negative slope B. Exponential decay C. Hyperbola D. Parabola

Q10: For a second-order reaction, the unit of rate constant is:

A. L mol⁻¹ s⁻¹ B. s⁻¹ C. mol L⁻¹ D. s

Q11: Which of the following influences the rate of a chemical reaction?

A. Temperature, concentration, catalyst B. Pressure only C. Volume only D. None of these

Q12: Catalysts affect reactions by:

A. Lowering activation energy B. Increasing activation energy C. Changing reaction enthalpy D. Changing reaction order

Q13: The integrated rate law for a first-order reaction is:

A. ln [A] = -kt + ln [A]₀ B. [A] = -kt + [A]₀ C. [A] = kt + [A]₀ D. 1/[A] = kt + 1/[A]₀

Q14: The units of rate of reaction are:

A. mol L⁻¹ s⁻¹ B. s⁻¹ C. mol L⁻¹ D. mol

Q15: A reaction is said to be first order if:

A. Rate ∝ concentration of one reactant B. Rate independent of concentration C. Rate ∝ square of concentration D. Rate ∝ product of two concentrations

Q16: The half-life of a zero-order reaction is:

A. Dependent on initial concentration B. Independent of initial concentration C. Constant D. Zero

Q17: The molecularity of an elementary reaction is:

A. Number of reactant molecules involved B. Order of reaction C. Rate constant D. Activation energy

Q18: The units of rate constant for third order reaction are:

A. L² mol⁻² s⁻¹ B. L mol⁻¹ s⁻¹ C. s⁻¹ D. mol L⁻¹

Q19: The temperature coefficient of a reaction rate is defined as:

A. Ratio of rate constants at T+10°C and T B. Difference of rate constants C. Sum of rate constants D. Product of rate constants

Q20: A reaction with high activation energy will:

A. Be slower at room temperature B. Be faster at room temperature C. Not occur D. Not be affected by catalyst