A sample of polyethene has an average molar mass of 28 000 g mol⁻¹. What is its average degree of polymerisation (C = 12, H = 1)?
Correct answer A. 1000
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MDCAT ECAT Chemistry MCQs
MDCAT ECAT Chemistry MCQs are multiple-choice questions on the FSc chemistry syllabus tested in medical and engineering entry tests, covering physical, inorganic, organic and industrial chemistry. You can practise each unit on its own, and every question on MCQs360 shows its correct answer instantly so you can check your understanding as you go.
- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
A PVC sample has an average molar mass of 125 000 g mol⁻¹. How many monomer units does an average chain contain (C = 12, H = 1, Cl = 35.5)?
Correct answer D. 2000
Methylmagnesium bromide reacts with carbon dioxide, and the product is hydrolysed with dilute acid. What is formed?
Correct answer A. Ethanoic acid
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Which reagent liberates CO₂ with ethanoic acid but not with phenol?
Correct answer C. Sodium hydrogencarbonate solution
Which reagent converts ethanoic acid into ethanoyl chloride?
Correct answer C. Thionyl chloride, SOCl₂
Heating ethanoic acid with phosphorus pentoxide (P₂O₅) forms ____.
Correct answer C. ethanoic anhydride
Reduction of ethanoic acid with LiAlH₄ gives ____.
Correct answer B. ethanol
Carboxylic acids have unusually high boiling points mainly because they ____.
Correct answer B. form hydrogen-bonded dimers
Alkaline hydrolysis of an ester to form a carboxylate salt and an alcohol is called ____.
Correct answer D. saponification
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What volume of CO₂ at STP is evolved when 6.0 g of ethanoic acid reacts with excess sodium hydrogencarbonate (CH₃COOH = 60)?
Correct answer C. 2.24 dm³
What volume of 0.1 mol dm⁻³ NaOH is needed to neutralise 0.45 g of anhydrous ethanedioic acid, (COOH)₂ (M = 90 g mol⁻¹)?
Correct answer C. 100 cm³
What is the percentage by mass of carbon in ethanoic acid, CH₃COOH (C = 12, H = 1, O = 16)?
Correct answer A. 40%
Amino acids in a protein chain are joined together by which type of bond?
Correct answer D. Peptide bond
The α-helix secondary structure of a protein is mainly stabilised by ____.
Correct answer B. hydrogen bonds between C=O and N−H groups
Which bond is a covalent link that helps stabilise the tertiary structure of many proteins?
Correct answer A. Disulfide bridge
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Essential amino acids are those that ____.
Correct answer C. cannot be made by the body and must be supplied in the diet
Enzymes increase the rate of biochemical reactions by ____.
Correct answer A. lowering the activation energy
The high specificity of an enzyme for its substrate is explained by the ____.
Correct answer C. lock and key model
Why does enzyme activity fall sharply at high temperatures such as 70 °C?
Correct answer A. The enzyme is denatured and its active site changes shape
At its isoelectric point, an amino acid exists mainly as a ____.
Correct answer A. zwitterion
About MDCAT ECAT Chemistry MCQs
This subject follows the units of the PMDC uniform MDCAT curriculum. Physical chemistry covers fundamental concepts and the mole, atomic structure, gases, liquids, solids, chemical equilibrium, reaction kinetics, thermochemistry and electrochemistry, with chemical bonding alongside. Inorganic chemistry covers s- and p-block elements and transition elements. Organic chemistry runs from fundamental principles and hydrocarbons through alkyl halides, alcohols and phenols, aldehydes and ketones and carboxylic acids to macromolecules, with a final unit on industrial chemistry such as dyes, adhesives and polymers. Chemistry carries 45 of the 180 MCQs in the PMDC MDCAT paper, a quarter of the total, so it is the second-largest section after Biology. Expect conceptual questions, named reactions and mechanisms, and short mole and equilibrium calculations.
Key facts to remember
- Chemistry has 45 of the 180 MCQs in the PMDC uniform MDCAT paper.
- One mole of any substance contains 6.022 × 10²³ particles (Avogadro's number, Nₐ).
- One mole of an ideal gas occupies 22.4 dm³ at STP (0 °C and 1 atm).
- The ideal gas equation is PV = nRT, with R = 8.314 J mol⁻¹ K⁻¹.
- Le Chatelier's principle: a system at equilibrium shifts to oppose any change imposed on it; a catalyst does not shift the position of equilibrium.
Exams that include MDCAT ECAT Chemistry MCQs
Pakistan
- MDCAT
- ECAT (UET)
- NUMS
- AKU
- FSc boards
India
- NEET
- JEE Main
Bangladesh
- HSC
- Medical Admission Test
How to prepare for MDCAT ECAT Chemistry MCQs
- Split revision into physical, inorganic and organic chemistry, and practise a mix of all three each week so nothing is left to the end.
- For organic units, write out reagents and conditions for each reaction on flashcards, since many MCQs ask what a reagent produces.
- Practise mole, yield and equilibrium calculations without a calculator, as entry tests reward quick mental arithmetic.
- Learn periodic trends and the exceptions examiners like, such as the anomalous behaviour of water and the electronic structures of chromium and copper.
Frequently asked questions
How many Chemistry MCQs are in the MDCAT paper?
Under the PMDC uniform MDCAT curriculum, Chemistry has 45 MCQs out of 180, a quarter of the paper. Only Biology carries more questions, so steady chemistry practice has a large effect on the final score.
Which exams use MDCAT ECAT Chemistry MCQs?
These MCQs suit MDCAT, ECAT (UET), NUMS and AKU entry tests in Pakistan and FSc board exams. The same FSc-level chemistry appears in NEET and JEE Main in India and in HSC and the medical admission test in Bangladesh.
Is organic chemistry important for MDCAT?
Yes. Organic chemistry makes up a large share of the chemistry units, from hydrocarbons and alkyl halides to carbonyl compounds, carboxylic acids and macromolecules. Questions focus on functional groups, reaction types, mechanisms such as SN1 and SN2, and characteristic tests.
Last reviewed October 2026