Chemical Engineering - MCQ Practice Questions

A first-order reaction has a rate constant of 0.693 min⁻¹. What is its half-life?

For a zero-order reaction, the integrated rate law is:

Which statement is correct about the residence time distribution (RTD) in an ideal plug flow reactor?

What is the order of reaction if the rate law is: rate = k[A]^($\frac{1}{2}$)[B]?

In an isothermal CSTR, if feed concentration C_A0 = 10 mol/m³ and outlet concentration C_A = 2 mol/m³, conversion is:

In a fluidized bed reactor (FBR), particles exhibit properties of both solids and fluids. What is this phenomenon called?

In a batch reactor operating at constant volume, the rate of reaction for a first-order reaction A→B is -rA = kCA. If the initial concentration is 2 mol/L and k = 0.1 min⁻¹, what will be the concentration after 10 minutes?

What is the primary advantage of a plug flow reactor (PFR) over a continuous stirred-tank reactor (CSTR) for reactions with high activation energy?

In the context of reaction kinetics, which statement best describes the rate-determining step (RDS) in a multi-step reaction mechanism?

What does the selectivity parameter in a competing reaction system measure?

In a batch reactor operating at constant temperature, the reaction A → B follows second-order kinetics with rate constant k = 0.05 L/(mol·min). If initial concentration of A is 2 M, what is the time required to reduce the concentration to 0.5 M?

For a reversible reaction A ⇌ B with forward rate constant k_f = 0.3 s⁻¹ and reverse rate constant k_r = 0.1 s⁻¹, what is the equilibrium constant K_c?

For the decomposition of N₂O₅ following first-order kinetics with k = 0.0074 s⁻¹, what fraction of reactant remains after 300 seconds?

Which of the following statements about residence time distribution (RTD) is correct?

The Damköhler number (Da) for a chemical reaction is defined as the ratio of:

The conversion in a batch reactor at any time can be found by integrating the rate equation. For a first-order reaction, the half-life is:

For the reaction 2A + B → Products, if the reaction is 2nd order in A and 1st order in B, the rate equation is:

What is the order of reaction if the half-life period is independent of initial concentration?

For the reaction A + B → C, the rate law is r = kC_A²C_B. What is the overall order of reaction?

For a reversible reaction at equilibrium, which statement is true?