ECAT Chemistry MCQs (Chapter-wise Solved 2008–2025)
Free ECAT Chemistry MCQs with Answers
Chapter-wise solved UET ECAT Chemistry MCQs — Solutions, Electrochemistry and Chemical Equilibrium. Molarity, colligative properties, Galvanic cells, buffers, Kc and Le Chatelier’s principle compiled from every UET ECAT paper 2008–2025.
Q1 Which type of force is present in gasoline?
- A) Dipole-dipole forces
- B) Dipole-induced dipole forces
- C) London dispersion forces
- D) Hydrogen bonding
Q2 The standard enthalpy of solution of NH4Cl is _____ kJ mol-1.
- A) +16.2
- B) –25.0
- C) +4.98
- D) +26.0
Q3 If 0.1 mole of acetic acid has been dissolved per dm³ of the solution, the percentage ionization of acetic acid will be:
- A) 13
- B) 15
- C) 1.3
- D) 0.1
Q4 Solubility of Ce2(SO4)3:
- A) Increases with temperature
- B) Decreases with temperature
- C) Shows exceptional behaviour
- D) Remains constant
Q5 Solubility of KClO3 can be decreased in H2O by:
- A) Removing K+ ions from the solution
- B) Removing ClO3-1 ions from the solution
- C) Adding KCl from outside
- D) Adding NaNO3 from outside
Q6 36 g of HCl dissolves in 100 g of solution. The density of HCl is 1.19 g cm-3. The molar mass of the HCl solution will be:
- A) 36.5 g/mol
- B) 100 g/mol
- C) 38.0 g/mol
- D) 11.73 g/mol
Q7 _____ extraction is controlled by partition law.
- A) Iodine
- B) Benzoic acid
- C) Solvent
- D) Stationary
Q8 The process of effusion is best understood by _____ law.
- A) Graham’s
- B) Charles’s
- C) Boyle’s
- D) None of these
Q9 _____ hybridization leads to a regular tetrahedral structure.
- A) sp3
- B) sp2
- C) sp
- D) All of these
Q10 Osmotic pressure of a solution is a _____ property.
- A) Obligative
- B) Fractional
- C) Colligative
- D) Automated
Q11 The crystals of _____ are ionic solids.
- A) Sugar
- B) Iron
- C) Diamond
- D) NaCl
Q12 Mole fraction of any compound is the ratio of moles of all components in a:
- A) Compound
- B) Solution
- C) Molecule
- D) Solid
Q13 Molarity is defined as the number of moles of any substance dissolved:
- A) Per dm3 of water
- B) In one gram of water
- C) Per m3 of water
- D) In 100 ml of water
Q14 As the number of solute particles increases, freezing point of the solution:
- A) Remains the same
- B) Increases
- C) First increases, then decreases
- D) Decreases
Q15 Boiling point constants help us to determine:
- A) Molar masses
- B) Volumes
- C) Pressures
- D) Masses
Q16 If 18.0 g of glucose is dissolved in 1 kg of water, boiling point of this solution should be:
- A) 100.52 °C
- B) 100.00 °C
- C) 100.052 °C
- D) Less than 100 °C
Q17 Molal freezing point constant of water is:
- A) 1.86
- B) 2.86
- C) 11.86
- D) 0.52
Q18 The vapour pressure lines for pure water as well as solutions of different concentrations are shown in a figure. Which line represents pure water?
- A) (i)
- B) (iii)
- C) (ii)
- D) (iv)
Q19 One mole of glucose was dissolved in 1 kg of water, ethanol, ether and benzene separately. The molal boiling-point constants of these solutions were 0.52, 1.75, 2.16 and 2.70 (in °C kg mol-1) respectively. Which figure shows benzene as solvent?
- A) Figure I
- B) Figure II
- C) Figure III
- D) Figure IV
Q20 10.0 g of glucose are dissolved in water to make 100 cm3 of its solution. Its molarity is:
- A) 0.55
- B) 0.1
- C) 10
- D) 1
Q21 A given solution contains 16.0 g of CH3OH, 92.0 g of C2H5OH and 36 g of water. Which statement about mole fraction of the components is true?
- A) Mole fraction of CH3OH is highest among all
- B) Mole fractions of C2H5OH and H2O are the same
- C) Mole fractions of CH3OH and C2H5OH are the same
- D) Mole fraction of H2O is the lowest among all
Q22 Freezing point will also be defined as that temperature at which the solid and liquid phases have the same:
- A) Concentration
- B) Ratio between the particles
- C) Vapour pressure
- D) Attraction between the phases
Q23 What mass of NaOH is present in 0.5 mole of sodium hydroxide?
- A) 40 gm
- B) 2.5 gm
- C) 15 gm
- D) 20 gm
Q24 The product of the concentrations of each ion in a saturated solution of a sparingly soluble salt at 298 K, raised to the power of their relative concentrations, is:
- A) Ksp
- B) Ka
- C) Kb
- D) Kw
Q25 An intermolecular force of attraction X is relatively stronger than other intermolecular forces; it stabilizes α-helix and β-pleated sheets of proteins. The double-helical structure of DNA is also stabilized by this force. Identify X.
- A) Van der Waals’ forces
- B) Hydrogen bonding
- C) Ionic interactions
- D) Dipole-dipole attraction
Q26 Solution contains 85.5 g of sucrose (C12H22O11) in 250 cm3. What is its molarity?
- A) 1 M
- B) 0.05 M
- C) 0.25 M
- D) 2 M
Q1 Which of the following compounds, in the form of aqueous solution, on reaction with sodium carbonate will produce carbon dioxide gas?
- A) H3C-COO-C2H5
- B) H3C2-COO-CH3
- C) H3C2-CO-OH
- D) H3C2-COO-C2H5
Q2 Plasma is the ionized gas mixture which consists of:
- A) Ions and electrons
- B) Electrons and neutral atoms
- C) Electrons, ions and neutral atoms
- D) Ions and neutral atoms
Q3 In conjugated protein molecules, the protein is attached or conjugated to some non-protein group which are called:
- A) Prosthetic group
- B) Aldehyde group
- C) Hydrogen bonding
- D) Peptide linkage
Q4 The stronger the oxidizing agent, the greater is the:
- A) Redox potential
- B) emf of the cell
- C) Oxidation potential
- D) Reduction potential
Q5 The emf produced by a Galvanic cell is known as:
- A) Redox potential
- B) Oxidation potential
- C) Cell potential
- D) None of the above
Q6 In nickel-cadmium battery, the cathode is composed of:
- A) Cd
- B) Ni(OH)2
- C) Ni
- D) NiO2
Q7 Concentrated sugar solution undergoes hydrolysis into glucose and fructose by an enzyme called:
- A) Zymase
- B) Invertase
- C) Cellulose
- D) Urease
Q8 The most durable metal plating on iron to protect against corrosion is:
- A) Tin plating
- B) Zinc plating
- C) Nickel plating
- D) Copper plating
Q9 When CuSO4 is electrolyzed in aqueous solution using copper electrodes, the substance which deposits at the cathode is:
- A) Copper metal
- B) Copper ions
- C) Hydrogen
- D) Oxygen
Q10 In an electrolytic cell, a salt bridge is used in order to:
- A) Pass the electric current
- B) Prevent the flow of ions
- C) Mix solution of two half-cells
- D) Allow movement of ions b/w two half-cells
Q1 According to the Lowry–Brønsted acid and base concept, H2O is:
- A) A salt
- B) An acid
- C) A base
- D) An amphoteric species
Q2 Equilibrium constant Kc for H2O ⇌ H+ + OH– can be written as:
- A) Kc = [H+] / ([H2][OH–])
- B) Kc = [OH–] / ([H+][OH–])
- C) Kc = [OH–][H+] / [H2O]
- D) Kc = [H2O] / ([H+][OH–])
Q3 _____ is used as a catalyst in Haber’s process for NH3 gas manufacture.
- A) Iron
- B) Carbon
- C) Copper
- D) Silver
Q4 In AgCl solution, some salt of NaCl is added; AgCl will be precipitated due to:
- A) Solubility
- B) Electrolyte
- C) Unsaturation effect
- D) Common ion effect
Q5 ‘Ka‘ for an acid is higher, the stronger is the acid; relate the strength of an acid with ‘pKa‘.
- A) Higher pKa, weaker the acid
- B) Lower pKa, stronger the acid
- C) pKa has no relation with acid strength
- D) Both A and B
Q6 Formation of NH3 is a reversible and exothermic process. What will happen on cooling?
- A) More reactant will form
- B) More N2 will be formed
- C) More H2 will be formed
- D) More product (NH3) will be formed
Q7 A buffer solution is that which resists / minimizes the change in _____.
- A) pOH
- B) pH
- C) Temperature
- D) Pressure
Get the printed ECAT Guess Paper Book
252 solved MCQs across Physics, Chemistry, Maths and English — year-wise. Powered by PK Bookshop.
Order on pkbookshop.com WhatsApp 0302-1417839About ECAT Chemistry — Solutions, Electrochemistry & Equilibrium
ECAT Chemistry carries 30 MCQs in the UET ECAT paper (students may swap this section with Computer Science). Three chapters — Solutions, Electrochemistry and Chemical Equilibrium — have collectively contributed 6–10 MCQs in every UET ECAT paper since 2008, making them the highest-yielding chapters to master. This page compiles every solved MCQ from these chapters, year-wise 2008–2025, with the printed answer key and typesetters’ notes where the source book key was mathematically incorrect.
UET ECAT Chemistry Pattern 2026
| Section | MCQs | Marks |
|---|---|---|
| Mathematics | 30 | 120 |
| Physics | 30 | 120 |
| Chemistry / Computer Science | 30 | 120 |
| English | 10 | 40 |
| Total | 100 | 400 |
+4 for each correct answer, –1 for each wrong answer. Time: 100 minutes. Chemistry questions are drawn from FSc Part-I and Part-II chapters 1–16.
Key formulas & concepts from Solutions
- Molarity (M) = moles of solute / dm³ of solution
- Molality (m) = moles of solute / kg of solvent
- Mole fraction (xA) = nA / ntotal
- Boiling-point elevation: ΔTb = Kb × m (water Kb = 0.52 °C kg mol⁻¹)
- Freezing-point depression: ΔTf = Kf × m (water Kf = 1.86 °C kg mol⁻¹)
- Raoult’s law for ideal solutions; colligative properties depend on particle number, not identity
- Partition law (Nernst distribution law) for solvent extraction
Key concepts from Electrochemistry
- Galvanic cells convert chemical energy into electrical energy; electrolytic cells do the reverse
- Oxidation at anode, reduction at cathode (mnemonic: AN OX, RED CAT)
- Salt bridge maintains electrical neutrality by letting ions migrate between half-cells
- Standard reduction potential (E°) — stronger oxidizing agents have higher E°
- Nickel-cadmium battery: Cd anode, NiO2 cathode
- Galvanization (zinc plating) is the most durable corrosion-protection for iron
Key concepts from Chemical Equilibrium
- Equilibrium constant Kc = [products] / [reactants] raised to their stoichiometric powers
- Le Chatelier’s principle: exothermic reactions shift forward on cooling
- Lowry–Brønsted: water is amphoteric (acts as acid and base)
- Acid strength: higher Ka = stronger acid; lower pKa = stronger acid
- Common-ion effect: adding a common ion shifts equilibrium toward undissociated form (suppresses ionization, causes precipitation)
- Buffers resist change in pH on addition of small amounts of acid or base
- Haber’s process: Fe catalyst, Mo promoter; exothermic N2 + 3H2 ⇌ 2NH3
How to prepare ECAT Chemistry in 2026
- Attempt past papers year-wise first. Over 60% of live ECAT Chemistry MCQs are direct or slightly rephrased from 2008–2025 papers.
- Memorise colligative property formulas (ΔTb, ΔTf, osmotic pressure) — 1–2 MCQs every year.
- Drill galvanic-cell diagrams: electrode sign convention, cell notation, emf calculation.
- Learn the difference between Kc, Ka, Kb, Ksp, Kw — UET loves to test this distinction.
- Use FSc Chemistry Part-I & II (Punjab Textbook Board) as your syllabus anchor; supplement with KIPS ECAT Chemistry or STEP worksheets.
Why QuizWing beats other ECAT Chemistry MCQ banks
Sites like ilmkidunya, paklearningspot, and geekmcq give you generic mixed MCQs or raw scanned PDFs. QuizWing is different because:
- Every MCQ is organised by chapter and year, so you know exactly which 2008 vs 2023 trends UET follows.
- Where the printed source answer key is mathematically wrong (e.g. ΔTb = 0.052 vs 0.52, absolute uncertainty in subtraction), we add a yellow note with the correct derivation — preserving the source key so you can cross-check with your book.
- Zero ads, zero pop-ups, zero signup — the page loads in under 1 second on 3G.
Related ECAT resources on QuizWing
- ECAT 2026 Hub — Apply Online, Test Date, Syllabus
- ECAT Past Papers (2005–2025) PDF Download
- ECAT Free Online Mock Test
- ECAT Physics MCQs Chapter-wise
- ECAT Mathematics MCQs Chapter-wise
- ECAT English MCQs Chapter-wise
Official references
FAQs — ECAT Chemistry
How many MCQs come from Chemistry in ECAT?
UET ECAT carries 30 Chemistry MCQs (or Computer Science as an alternative). Solutions, Electrochemistry and Chemical Equilibrium are three of the highest-yielding chapters, collectively contributing 6–10 MCQs per paper.
What is the standard definition of molarity?
Molarity is the number of moles of solute dissolved per dm³ of solution (not per dm³ of water). The strictly correct definition uses solution volume — although older Pakistani textbooks still print “per dm³ of water”.
What is the difference between molarity and molality?
Molarity = moles of solute per dm³ of solution (temperature-dependent). Molality = moles of solute per kg of solvent (temperature-independent). Molality is used in colligative property formulas because it doesn’t change with temperature.
What catalyst is used in the Haber process?
Iron is the industrial catalyst used in Haber’s process for NH₃ manufacture. Molybdenum is added as a promoter.
What is the role of the salt bridge in a Galvanic cell?
A salt bridge allows the movement of ions between the two half-cells, maintaining electrical neutrality and completing the circuit without letting the two electrolytes mix.
Why is freezing point depression a colligative property?
Freezing point depression depends only on the number of solute particles, not their identity. It is directly proportional to the molality of the solution: ΔTf = Kf × m.
What is the common ion effect?
When a salt that shares an ion with a sparingly soluble salt is added to a saturated solution, the solubility of the sparingly soluble salt decreases — e.g. adding NaCl to AgCl solution precipitates AgCl.
How do buffers resist pH change?
A buffer contains a weak acid and its conjugate base (or weak base and its conjugate acid) in comparable amounts. When H⁺ is added, the conjugate base neutralises it; when OH⁻ is added, the weak acid neutralises it — keeping pH nearly constant.
Is QuizWing’s ECAT Chemistry MCQ bank free?
Yes — all 43 ECAT Chemistry MCQs on this page are free with answers. The complete printed ECAT Guess Paper (252 MCQs) is available at pkbookshop.com or WhatsApp 0302-1417839.
What is the Kf value of water for ECAT?
The molal freezing point depression constant (Kf) of water is 1.86 °C kg mol⁻¹ and Kb is 0.52 °C kg mol⁻¹.