100+ Free COREN Chemical Practice Questions

Pass your COREN Engineering Practice Exam — Chemical Engineering Specialisation exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

~65% Pass Rate

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More Council for the Regulation of Engineering in Nigeria (COREN)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

COREN Engineering Practice Exam — Agricultural Engineering Specialisation (Nigeria)

Practice Questions100 questions

COREN Engineering Practice Exam — Civil Engineering Specialisation (Nigeria)

Practice Questions100 questions

COREN Engineering Practice Exam — Electrical/Electronic Engineering Specialisation (Nigeria)

Practice Questions100 questions

COREN Engineering Practice Exam — Mechanical Engineering Specialisation (Nigeria)

Practice Questions100 questions

COREN Engineering Practice Examination — Registered Engineer (Nigeria)

Practice Questions100 questions

COREN Engineering Practice Examination — Registered Engineering Craftsman (Nigeria)

Practice Questions100 questions

2026 Statistics

Key Facts: COREN Chemical Exam

100

CBT Questions

COREN

2 hours

Time Limit

COREN

50%

Passing Mark

COREN Guidelines

₦85,000

Application Fee

COREN 2026

4 years

Post-Grad Experience

COREN Requirements

CBT + P.I.

Exam Format

COREN

The COREN Chemical Engineering exam is a 2-hour CBT containing 100 MCQs. It requires a passing score of 50% and has an application fee of ₦85,000. It covers stoichiometry, thermodynamics, mass/heat transfer, process design, control, safety, and Nigerian codes/ethics. Pass rate is approximately 65%.

Sample COREN Chemical Practice Questions

Try these sample questions to test your COREN Chemical exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1For a binary mixture at vapor-liquid equilibrium, what is the fundamental criterion for phase equilibrium in terms of fugacity?

A.The fugacities of each component in both phases must be equal.

B.The sum of the fugacities of all components in the liquid phase must equal that in the vapor phase.

C.The fugacity coefficient of each component must equal its activity coefficient.

D.The fugacity of the mixture in the vapor phase must be zero.

Explanation: Phase equilibrium requires that the temperature, pressure, and chemical potential of each species be equal across all phases. Since fugacity is directly related to chemical potential, this translates to the equality of fugacity for each species in the liquid and vapor phases. This criterion is used to calculate vapor-liquid equilibrium (VLE) using gamma-phi or phi-phi approaches.

2What does the Gibbs-Duhem equation describe regarding the chemical potentials of components in a mixture at constant temperature and pressure?

A.The sum of the chemical potentials of all components must be zero.

B.The change in chemical potentials of components are mutually dependent.

C.The chemical potentials of all components must be equal.

D.The chemical potential of a component is independent of the composition.

Explanation: The Gibbs-Duhem equation at constant temperature and pressure states that the sum of the mole fractions multiplied by the differential of the chemical potentials is zero (sum x_i d_mu_i = 0). This means that the chemical potentials of components in a mixture cannot change independently; a change in one chemical potential dictates the change in the others. It is widely used to verify the thermodynamic consistency of experimental VLE data.

3Which of the following equations correctly expresses the relationship between the standard Gibbs free energy change of a reaction and its equilibrium constant?

A.Delta G° = -R T ln K

B.Delta G° = R T ln K

C.Delta G° = -R T K

D.Delta G° = -ln K / (R T)

Explanation: The standard Gibbs free energy change of a reaction (Delta G°) is related to the thermodynamic equilibrium constant (K) by the equation Delta G° = -R T ln K. A negative Delta G° corresponds to an equilibrium constant greater than 1, indicating that the products are favored at equilibrium. This relationship allows chemical engineers to calculate equilibrium conversions for various reaction conditions.

4In a steady-state open system with one inlet and one outlet, how is the first law of thermodynamics represented under negligible kinetic and potential energy changes?

A.Q + W = Delta H

B.Q - W = Delta U

C.Q + W = Delta U

D.Q - W = Delta H

Explanation: For a steady-state flow process (open system) with one inlet and one outlet, the energy balance simplifies to Q + W_s = Delta H, assuming kinetic and potential energy changes are negligible. Here, Q is the rate of heat transfer, W_s is the shaft work, and Delta H is the enthalpy change between outlet and inlet streams. This form is essential for analyzing turbines, compressors, and heat exchangers.

5According to the Second Law of Thermodynamics, what must be the entropy change of the universe for any real, irreversible process?

A.It must be equal to zero.

B.It must be less than zero.

C.It must be greater than zero.

D.It remains constant.

Explanation: The Second Law of Thermodynamics states that the total entropy of the universe (system plus surroundings) must increase for any spontaneous or real (irreversible) process (Delta S_univ > 0). For a reversible process, the entropy change of the universe is zero. No real process can cause a decrease in the entropy of the universe, setting the fundamental limit on energy conversion efficiency.

6How is the compressibility factor (Z) defined, and what is its value for an ideal gas?

A.Z = P V / (R T); Z = 1

B.Z = P R / (V T); Z = 0

C.Z = V / (P R T); Z = 1

D.Z = P V / (R T); Z = 0

Explanation: The compressibility factor is defined as Z = P V / (R T), where V is the molar volume. For an ideal gas, Z is equal to 1 under all temperatures and pressures, indicating that intermolecular forces and molecular volumes are negligible. Deviations of Z from 1 indicate non-ideal behavior, with Z < 1 representing dominant attractive forces and Z > 1 representing dominant repulsive forces.

7According to the Arrhenius equation, how does the reaction rate constant (k) change as the activation energy (E_a) increases at constant temperature?

A.k increases linearly.

B.k decreases exponentially.

C.k increases exponentially.

D.k remains unchanged.

Explanation: The Arrhenius equation is k = A exp(-E_a / (R T)). If the activation energy (E_a) increases at a constant temperature, the term (-E_a / (R T)) becomes more negative, causing the exponential term, and therefore the rate constant (k), to decrease exponentially. This explains why reactions with high activation energies are slow unless conducted at high temperatures or in the presence of a catalyst.

8For a first-order liquid-phase reaction seeking 90% conversion, how does the required volume of a single Continuous Stirred-Tank Reactor (CSTR) compare to a single Plug Flow Reactor (PFR)?

A.The CSTR volume is smaller than the PFR volume.

B.The CSTR volume is equal to the PFR volume.

C.The CSTR volume is significantly larger than the PFR volume.

D.The PFR volume is infinitely large compared to the CSTR.

Explanation: For a first-order reaction with positive order kinetics, the rate of reaction decreases as conversion increases. In a CSTR, the reaction occurs entirely at the outlet concentration, which is the lowest reactant concentration and therefore the lowest rate. In contrast, a PFR operates at reactant concentrations ranging from feed to outlet, yielding a higher average rate. Consequently, a CSTR requires a much larger volume than a PFR for the same conversion.

9Under the Langmuir-Hinshelwood mechanism for a catalytic reaction A + B -> C, what is the key assumption regarding the reacting species?

A.Only species A is adsorbed on the catalyst surface, while B reacts from the gas phase.

B.Both species A and B must be adsorbed on adjacent active sites of the catalyst surface to react.

C.The reaction occurs entirely in the gas phase without adsorption.

D.Product C must remain permanently adsorbed on the surface.

Explanation: The Langmuir-Hinshelwood mechanism assumes that both reactants (A and B) must adsorb onto the active sites of the catalyst surface before they can react. Once both species are adsorbed on adjacent sites, they undergo a surface reaction to form product C, which then desorbs. This differs from the Eley-Rideal mechanism, where one species reacts from the fluid phase with an adsorbed species.

10In industrial practice, why are multiple smaller CSTRs arranged in series preferred over a single large CSTR achieving the same conversion?

A.Multiple CSTRs in series behave closer to a plug flow reactor, reducing total volume.

B.Smaller reactors are always more expensive to operate.

C.A series of CSTRs decreases the overall conversion of the reaction.

D.It prevents any bypass or short-circuiting of reactants.

Explanation: As the number of CSTRs in series increases, the concentration profile approaches that of a Plug Flow Reactor (PFR). Since a PFR is more efficient than a CSTR for positive-order kinetics, arranging CSTRs in series reduces the total reactor volume required to achieve a target conversion. In the limit of infinite CSTRs in series, the behavior is identical to a single PFR.

About the COREN Chemical Exam

The COREN Engineering Practice Exam for Chemical Engineering validates professional competency, technical knowledge, and ethical readiness. It is a mandatory milestone for graduate engineers seeking registration as Registered Engineers (R.Eng) in Nigeria. The exam evaluates core chemical engineering principles—such as thermodynamics, kinetics, transport phenomena, and unit operations—alongside Nigerian environmental regulations, plant safety (HAZOP), and professional codes of conduct.

Assessment

100 multiple-choice questions (CBT)

Time Limit

2 hours

Passing Score

50%

Exam Fee

₦85,000 (Council for the Regulation of Engineering in Nigeria (COREN))

COREN Chemical Exam Content Outline

15%

Thermodynamics & Kinetics

First and second laws, volumetric properties, phase equilibria, chemical reaction kinetics, reactor sizing, and catalysts.

20%

Fluid Mechanics & Heat Transfer

Bernoulli's equation, pipe sizing, pumps, heat exchangers (LMTD and NTU methods), conduction, convection, and radiation.

20%

Mass Transfer & Separation Operations

Fick's law, distillation column design, gas absorption, liquid-liquid extraction, drying, and membrane processes.

15%

Process Stoichiometry & Mass/Energy Balances

Material balances (steady and unsteady), energy balances with and without reaction, combustion, recycle, bypass, and purges.

15%

Process Design, Control & Instrumentation

Process flow diagrams, piping and instrumentation diagrams (P&IDs), process dynamics, feedback loops, tuning, and instrumentation.

15%

Plant Safety, Ethics & Nigerian Engineering Regulations

COREN Act, NSE ethics, liability, HAZOP, occupational safety (HSE), and Nigerian environmental regulations (NESREA, EGASPIN).

How to Pass the COREN Chemical Exam

What You Need to Know

Passing score: 50%
Assessment: 100 multiple-choice questions (CBT)
Time limit: 2 hours
Exam fee: ₦85,000

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

COREN Chemical Study Tips from Top Performers

1Master steady-state material balances, especially involving recycle and purge streams, as these are highly tested.

2Understand the difference between McCabe-Thiele distillation assumptions and how feed quality affects the q-line.

3Review the LMTD and NTU methods for sizing shell-and-tube heat exchangers, and fluid flow calculations using the Fanning friction factor.

4Memorize the key provisions of the COREN Act, the functions of COREN, and the differences between COREN and the NSE.

5Study the steps of a HAZOP study, identifying deviations using guide words (e.g., MORE, LESS, NO) on process nodes.

6Understand Nigerian environmental regulatory bodies like NESREA and standard oil & gas effluent guidelines (EGASPIN).

Frequently Asked Questions

What is the COREN Chemical Engineering specialisation exam?

It is the professional practice examination administered by COREN for graduate chemical engineers in Nigeria. Passing this exam, along with the subsequent oral interview, grants the title of Registered Engineer (R.Eng) and the legal right to practice engineering in Nigeria.

What is the format and duration of the COREN exam?

The exam is a Computer-Based Test (CBT) consisting of 100 multiple-choice questions, with a time limit of 2 hours (120 minutes). In addition to the CBT, candidates must submit technical reports and undergo an oral interview/defense.

What is the passing score for the exam?

The passing score for the COREN Engineering Practice Exam is typically 50%. Candidates must show competency across both the technical and the professional regulation/ethics sections.

How much does the application and registration process cost?

The application and processing fee for direct registration through the exam route is ₦85,000. Upon passing the exam and interview, a separate induction fee of approximately ₦63,000 is required for full registration.

What topics are tested in the Chemical Engineering specialisation paper?

The exam covers chemical engineering core areas: Material and Energy Balances (15%), Fluid Flow & Heat Transfer (20%), Mass Transfer & Separations (20%), Thermodynamics & Reactor Kinetics (15%), Process Control & Design (15%), and Plant Safety, Professional Ethics, and Nigerian Engineering Regulations (15%).