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MDCAT Chemistry Questions
Practise chemistry (science) for the Medical and Dental College Admission Test: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Chemistry practice
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Q1.Which bond is formed by the sharing of electrons?
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Answer: D — Covalent
Covalent bonds share electron pairs.
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Q2.What is the mass of 1.5 mol of sodium chloride (NaCl)? (Molar mass 58.5 g/mol)
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Answer: A — 87.75 g
Mass = moles × molar mass = 1.5 × 58.5 g/mol = 87.75 g.
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Q3.The periodic table is arranged in order of increasing:
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Answer: C — Atomic number
The modern periodic table orders elements by atomic number.
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Q4.What is the mass of 0.5 mol of water (H₂O)? (Molar mass 18 g/mol)
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Answer: B — 9 g
Mass = moles × molar mass = 0.5 × 18 g/mol = 9 g.
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Q5.The process of converting a solid directly into a gas is called:
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Answer: D — Sublimation
Sublimation, e.g. dry ice or naphthalene.
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Q6.What is the mass of 4 mol of carbon dioxide (CO₂)? (Molar mass 44 g/mol)
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Answer: B — 176 g
Mass = moles × molar mass = 4 × 44 g/mol = 176 g.
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Q7.The chemical formula of common salt is:
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Answer: C — NaCl
Common salt is sodium chloride.
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Q8.4 g of HCl (molar mass 36.5) is dissolved to make 500 mL of solution. Find the molarity.
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Answer: D — 0.219 M
Moles = 4/36.5 = 0.11; molarity = moles ÷ litres = 0.11 ÷ 0.5 = 0.219 M.
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Q9.A solution with pH 3 is:
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Answer: A — Acidic
pH below 7 is acidic.
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Q10.What is the pH of a solution with [H⁺] = 10⁻³ mol/L?
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Answer: D — 3
pH = −log[H⁺] = −log(10⁻³) = 3.
How to approach chemistry questions
Moles = mass ÷ molar mass; molarity = moles ÷ litres. pH = −log[H⁺] and pH + pOH = 14 at 25 °C. For concepts, link each property to its position in the periodic table.
About MDCAT
Medical and Dental College Admission Test — conducted by Pakistan Medical & Dental Council (PM&DC). Admission test for medical and dental colleges in Pakistan.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
MDCAT practice topics
| Topic | Section | Question source |
|---|---|---|
| Biology | Science | Question bank |
| Chemistry | Science | Calculated + question bank |
| Physics | Science | Calculated + question bank |
| English Grammar | English | Question bank |