Chemical Engineering - MCQ Practice Questions

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

Which type of reactor provides the best conversion for a reversible exothermic reaction?

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

In a CSTR operating at steady state, if residence time is doubled and inlet concentration remains constant, how does conversion change for a first-order reaction?

What is the activation energy for a reaction if its rate constant doubles when temperature increases from 300K to 310K?

For parallel reactions A→B and A→C, the selectivity of B over C is defined as:

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

In a catalytic reaction, which parameter does NOT affect the rate of reaction?

For the reaction 2A → B, if initial concentration of A is 2 mol/L and concentration after 5 minutes is 1 mol/L, calculate rate constant (assuming second-order):

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:

Which reactor configuration gives maximum yield for a series reaction A→B→C where k₁ >> k₂?

The Damköhler number (Da) in chemical reactor design represents:

For a reaction with E_a = 50 kJ/mol, if temperature is increased from 300K to 400K, by what factor does rate constant increase? (R = 8.314 J/mol·K)

In enzyme catalysis, what does the Michaelis-Menten constant (K_m) represent?

For an exothermic reaction in an adiabatic reactor, what happens to the reaction rate as conversion increases?

Which approximation is used in steady-state kinetics for enzyme reactions?

For autocatalytic reactions, which reactor gives highest conversion at equilibrium?

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

For consecutive reactions A→B→C, the concentration of intermediate B is maximum at time t_max. This time depends on: