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Exam Review

Key Facts: EGEL Plus Química Exam

200

Total questions on the official EGEL Plus Química exam (140 disciplinary + 60 transversal)

Ceneval, Guía para el sustentante EGEL Plus QUIM

9 hours

Total response time administered across two 4.5-hour sessions

Ceneval, Guía para el sustentante EGEL Plus QUIM

1000

Minimum Índice Ceneval score required for Testimonio de Desempeño Satisfactorio

Ceneval, Guía para el sustentante EGEL Plus QUIM

1150

Threshold Índice Ceneval score for Testimonio de Desempeño Sobresaliente

Ceneval, Guía para el sustentante EGEL Plus QUIM

Allowed

Non-programmable scientific calculator permitted per Ceneval examination rules

Ceneval, Guía para el sustentante EGEL Plus QUIM

Ceneval's EGEL Plus QUIM is a 200-item, nine-hour Spanish exit exam covering three chemistry competency areas and transversal communication.

Sample EGEL Plus Química Practice Questions

Try these sample questions to review concepts for the EGEL Plus Química exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 84+ question experience with AI tutoring.

1A 25.00 mL aliquot of 0.100 M acetic acid (CH3COOH, Ka = 1.8 × 10⁻⁵) is titrated with 0.100 M NaOH. What is the pH of the solution at the half-equivalence point (after the addition of 12.50 mL of NaOH)?
A.4.74
B.7.00
C.2.87
D.8.72
Explanation: At the half-equivalence point of a weak acid titration, exactly half of the initial acetic acid has been converted to its conjugate base acetate, making [CH3COOH] = [CH3COO⁻]. According to the Henderson-Hasselbalch equation (pH = pKa + log([A⁻]/[HA])), the logarithmic term becomes log(1) = 0, so pH = pKa = -log(1.8 × 10⁻⁵) = 4.74.
2A standard solution of potassium permanganate (KMnO4) with a concentration of 2.00 × 10⁻⁴ M yields an absorbance of 0.440 at 525 nm in a 1.00 cm cuvette. An unknown solution of KMnO4 analyzed under identical optical conditions gives an absorbance of 0.660. Assuming adherence to the Beer-Lambert law, what is the concentration of the unknown sample?
A.1.33 × 10⁻⁴ M
B.3.00 × 10⁻⁴ M
C.4.40 × 10⁻⁴ M
D.2.50 × 10⁻⁴ M
Explanation: By the Beer-Lambert law (A = ε·b·c), absorbance is directly proportional to concentration when path length b and molar absorptivity ε are constant. Setting up the direct proportion: c_unk = c_std · (A_unk / A_std) = (2.00 × 10⁻⁴ M) · (0.660 / 0.440) = (2.00 × 10⁻⁴ M) · 1.50 = 3.00 × 10⁻⁴ M.
3A 0.5000 g solid sample containing sulfate is dissolved and precipitated quantitatively as barium sulfate (BaSO4, molar mass = 233.39 g/mol). The ignited precipitate weighs 0.3500 g. What is the percentage by mass of sulfate (SO4²⁻, molar mass = 96.06 g/mol) in the original sample?
A.14.41%
B.28.81%
C.41.16%
D.70.00%
Explanation: The gravimetric factor for sulfate in barium sulfate is GF = 96.06 / 233.39 = 0.41159. The mass of sulfate in the precipitate is 0.3500 g × 0.41159 = 0.14406 g. The mass percentage in the original 0.5000 g sample is (0.14406 g / 0.5000 g) × 100% = 28.81%.
4In a gas chromatographic separation using a capillary column, an unretained solute elutes at 1.20 min. A target analyte elutes at 4.80 min with a baseline peak width of 0.30 min. What is the retention factor (capacity factor, k) of the target analyte?
A.4.00
B.3.00
C.0.75
D.2.75
Explanation: The retention factor k measures how long an analyte is retained relative to an unretained compound: k = (tR - t0) / t0. Substituting the measured values yields k = (4.80 min - 1.20 min) / 1.20 min = 3.60 / 1.20 = 3.00.
5In an HPLC analysis, a chromatographic peak has a retention time (tR) of 6.00 min and a width at half-height (w1/2) of 0.15 min. What is the theoretical plate count (N) for this column?
A.8872
B.1600
C.25600
D.6400
Explanation: The number of theoretical plates determined from the peak width at half-height is given by N = 5.545 · (tR / w1/2)². Substituting the parameters yields N = 5.545 · (6.00 / 0.15)² = 5.545 · (40)² = 5.545 · 1600 = 8872.
6An unknown compound has the molecular formula C8H8O2. How many degrees of unsaturation (rings plus π bonds) does it contain?
A.4
B.5
C.6
D.9
Explanation: Degrees of unsaturation = (2C + 2 + N − H − X) / 2. Oxygen does not enter the formula. For C8H8O2: (2·8 + 2 − 8) / 2 = 10 / 2 = 5, consistent, for example, with a benzene ring (4) plus one C=O (1), as in methyl benzoate or phenylacetic acid.
7What is the potential of a zinc indicator electrode immersed in a 0.0050 M Zn²⁺ solution at 25 °C, given that E°(Zn²⁺/Zn) = -0.763 V? (Use E = E° - (0.0592/n) · log(1/[Zn²⁺]))
A.-0.695 V
B.-0.831 V
C.-0.763 V
D.-0.899 V
Explanation: For the half-reaction Zn²⁺ + 2e⁻ -> Zn(s), n = 2. The Nernst equation is E = -0.763 V - (0.0592 / 2) · log(1 / 0.0050). Here log(200) = 2.301, so the correction term is 0.0296 · 2.301 = 0.0681 V. Subtracting yields E = -0.763 V - 0.0681 V = -0.831 V.
8When titrating Ca²⁺ with standard EDTA at pH 10 in an ammoniacal buffer using Eriochrome Black T (EBT) as an indicator, what causes the sharp color transition from wine-red to pure blue at the endpoint?
A.The direct oxidation of the EBT dye by atmospheric oxygen
B.The displacement of free EBT from the wine-red Ca-EBT complex as EDTA binds all available Ca²⁺
C.The precipitation of calcium hydroxide which removes the red chromophore
D.The complete protonation of EDTA into its fully acidic H4Y form
Explanation: Eriochrome Black T binds Ca²⁺ to form a wine-red complex. Because the formation constant of Ca-EDTA is much larger than that of Ca-EBT, EDTA extracts Ca²⁺ from the dye as the equivalence point is reached, liberating free uncomplexed EBT which exists in its blue HIn²⁻ form at pH 10.
9Which of the following compounds is commonly used as an authoritative primary standard for the standardization of aqueous sodium hydroxide (NaOH) solutions?
A.Potassium hydrogen phthalate (KHP)
B.Anhydrous sodium carbonate (Na2CO3)
C.Concentrated hydrochloric acid (HCl)
D.Sodium thiosulfate pentahydrate
Explanation: Potassium hydrogen phthalate (KHP, KHC8H4O4) is a non-hygroscopic, high-purity crystalline solid with a high molar mass (204.22 g/mol) and stable stoichiometric monoprotic acidity, making it the primary standard of choice for standardizing strong bases such as NaOH.
10The solubility product constant (Ksp) of lead(II) iodide (PbI2) is 7.1 × 10⁻⁹ at 25 °C. What is the molar solubility of PbI2 in pure water?
A.8.43 × 10⁻⁵ M
B.1.21 × 10⁻³ M
C.1.92 × 10⁻³ M
D.1.53 × 10⁻³ M
Explanation: The dissolution equilibrium is PbI2(s) <=> Pb²⁺ + 2 I⁻. If s is molar solubility, [Pb²⁺] = s and [I⁻] = 2s. Thus Ksp = s · (2s)² = 4s³ = 7.1 × 10⁻⁹. Solving for s: s³ = 1.775 × 10⁻⁹, which yields s = (1.775 × 10⁻⁹)^(1/3) = 1.21 × 10⁻³ M.

About the EGEL Plus Química Exam

Independent EGEL Plus Química practice by OpenExamPrep. The current official Spanish examination has 200 three-option items covering Análisis Químico, Transformaciones Químicas, Procesos Químicos, and transversal language and communication. This English-language four-option MCQ bank is a study adaptation, not an official translation or format simulation. Stems and explanations are in English, but most language and communication items use Spanish sentences and passages, because Spanish usage is the skill being tested; a few reading items keep English passages as part of the adaptation.

Exam sponsor: Centro Nacional de Evaluación para la Educación Superior (Ceneval). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

200 three-option multiple-choice items: 140 disciplinary items (Análisis Químico 50, Transformaciones Químicas 50, Procesos Químicos 40) and 60 transversal items in Comprensión Lectora and Redacción Indirecta.

Time Limit

Two sessions of 4.5 hours each (9 hours total response time)

Passing Score

Reported on the Índice Ceneval (700-1300): 1000-1149 Satisfactorio, 1150-1300 Sobresaliente, below 1000 Aún no satisfactorio

Exam / Certification Fees

MXN 1,885 for the 2026 national Examen desde casa; institutional administrations may charge a different amount

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

50 of 140 disciplinary items

Análisis Químico

Classical, instrumental, and structural analysis

50 of 140 disciplinary items

Transformaciones Químicas

Stoichiometry, equilibrium, kinetics, thermodynamics, and synthesis

40 of 140 disciplinary items

Procesos Químicos

Unit operations, process variables, and safety

60 of 200 total items

Lenguaje y Comunicación

60 transversal items: reading comprehension of technical and scientific texts (30 items) and indirect writing assessing grammar, syntax, and cohesion (30 items)

Preparing for the EGEL Plus Química Exam

What You Need to Know

  • Passing score: Reported on the Índice Ceneval (700-1300): 1000-1149 Satisfactorio, 1150-1300 Sobresaliente, below 1000 Aún no satisfactorio
  • Assessment: 200 three-option multiple-choice items: 140 disciplinary items (Análisis Químico 50, Transformaciones Químicas 50, Procesos Químicos 40) and 60 transversal items in Comprensión Lectora and Redacción Indirecta.
  • Time limit: Two sessions of 4.5 hours each (9 hours total response time)
  • Exam / certification fees: MXN 1,885 for the 2026 national Examen desde casa; institutional administrations may charge a different amount Official sources

Using Our Practice Resources

  • Work through all 84 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

EGEL Plus Química: Suggested Study Strategy

1Review quantitative chemistry calculations: practice pH, buffer capacity, equilibrium constants, titration curves, and thermodynamic functions using a standard scientific calculator.
2Master instrumental analysis principles, especially chromatography retention factors, Beer-Lambert spectrophotometry, and electrochemical cell potential equations.
3Work through reaction mechanisms and synthesis (substitution versus elimination, additions, carbonyl chemistry, chelating agents), and practice deducing structures from IR, NMR and mass spectra.
4Give Procesos Químicos a full share of study time (40 of 140 disciplinary items): unit operations such as acid-base extraction, azeotropic distillation and recrystallization, material and energy balances, yield and atom economy, and lab safety under NOM-018-STPS-2015, NOM-052-SEMARNAT-2005 and NOM-002-STPS-2010.
5Budget your time across the two 4.5-hour testing blocks and review scientific text comprehension and grammar rules for the transversal section.

Frequently Asked Questions

What is the EGEL Plus Química?

The EGEL Plus Química (EGEL Plus QUIM) is a standardized exit examination designed and administered by Ceneval in Mexico to assess the professional competencies of graduating seniors and alumni of Licenciatura en Química programs. Many universities use it as an official graduation and titulación mechanism.

How many questions are on the real EGEL Plus Química exam and how long is it?

The current official guide specifies 200 three-option items and nine hours of response time in two 4.5-hour sessions: 140 disciplinary items across three areas and 60 transversal language and communication items.

How is the EGEL Plus Química scored?

Results are reported on the Índice Ceneval scale ranging from 700 to 1300 points: 700 to 999 is Aún no satisfactorio, 1000 to 1149 is Testimonio de Desempeño Satisfactorio (TDS), and 1150 to 1300 is Testimonio de Desempeño Sobresaliente (TDSS).

Are calculators allowed on the EGEL Plus Química?

Yes. A non-programmable scientific calculator is permitted per Ceneval rules for the EGEL Plus QUIM exam. Graphing, programmable, or network-capable devices are strictly prohibited.

Why is this practice bank in English if the official exam is in Spanish?

The official Ceneval examination is administered in Spanish. OpenExamPrep provides this bank as an independent English-language MCQ study adaptation, not an official translation. Chemistry questions and explanations are in English, while most language and communication items use Spanish sentences and passages, because Spanish usage is the skill the transversal section measures; a few reading items keep English scientific passages. Official items have three options; this bank uses four.

How does EGEL Plus Química differ from Química Clínica and QFB?

Ceneval maintains separate EGEL Plus examinations for Química (QUIM, focused on fundamental pure and applied chemical disciplines), Química Clínica (QUICLI, focused on clinical diagnostics and hematology), and Químico Farmacéutico Biólogo (QFB, focused on pharmacology, pharmacy, and bioanalysis). This bank specifically covers EGEL Plus Química.