Which type of reactor provides the best conversion for a reversible exothermic reaction?
Answer: C
PFR with heat removal maintains optimal temperature profile and continuous removal of products, favoring forward reaction equilibrium
Q.3Easy
For a zero-order reaction, the integrated rate law is:
Answer: A
Zero-order integrated rate law: [A] = [A]₀ - kt, linear with time
Q.4Medium
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?
Answer: B
For CSTR: X = kτ/(1+kτ). Increasing τ increases conversion for first-order reactions
Q.5Hard
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:
Answer: A
Selectivity = rate of desired product formation/rate of undesired product formation
Q.7Easy
Which statement is correct about the residence time distribution (RTD) in an ideal plug flow reactor?
Answer: B
In ideal PFR, E(t) = δ(t-τ), meaning all molecules have identical residence time equal to τ
Q.8Medium
In a catalytic reaction, which parameter does NOT affect the rate of reaction?
Answer: C
Catalyst doesn't change ΔG or equilibrium position; it only lowers Eₐ. ΔG determines feasibility, not rate
Q.9Medium
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):
Answer: A
For 2nd order: 1/[A] = 1/[A]₀ + kt; 11 = 21 + k(5); k = 0.1 L/(mol·min)
Q.10Easy
What is the order of reaction if the rate law is: rate = k[A]^(21)[B]?
Answer: B
Order = sum of exponents = 21 + 1 = 1.5 (fractional order, common in enzyme kinetics)
Q.11Easy
In an isothermal CSTR, if feed concentration C_A0 = 10 mol/m³ and outlet concentration C_A = 2 mol/m³, conversion is:
