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GAMSAT Chemistry Questions
Practise chemistry (science) for the Graduate Medical School Admissions 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.Water has a maximum density at about:
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Answer: D — 4 °C
Water is densest at about 4 °C.
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Q2.What is the pH of a solution with [H⁺] = 10⁻¹ mol/L?
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Answer: C — 1
pH = −log[H⁺] = −log(10⁻¹) = 1.
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Q3.The noble gas used in advertising signs that glows red-orange is:
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Answer: B — Neon
Neon glows red-orange in discharge tubes.
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Q4.What is the mass of 3 mol of ammonia (NH₃)? (Molar mass 17 g/mol)
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Answer: C — 51 g
Mass = moles × molar mass = 3 × 17 g/mol = 51 g.
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Q5.The periodic table is arranged in order of increasing:
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Answer: B — Atomic number
The modern periodic table orders elements by atomic number.
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Q6.What is the mass of 3 mol of carbon dioxide (CO₂)? (Molar mass 44 g/mol)
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Answer: C — 132 g
Mass = moles × molar mass = 3 × 44 g/mol = 132 g.
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Q7.Which of these is an alkali metal?
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Answer: A — Potassium
Potassium is in Group 1 (alkali metals).
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Q8.What is the mass of 1.5 mol of ammonia (NH₃)? (Molar mass 17 g/mol)
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Answer: A — 25.5 g
Mass = moles × molar mass = 1.5 × 17 g/mol = 25.5 g.
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Q9.An oxidation reaction involves:
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Answer: B — Loss of electrons
Oxidation is loss of electrons (OIL RIG).
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Q10.What is the pH of a solution with [H⁺] = 10⁻² mol/L?
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Answer: C — 2
pH = −log[H⁺] = −log(10⁻²) = 2.
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 GAMSAT
Graduate Medical School Admissions Test — conducted by Australian Council for Educational Research (ACER). Graduate-entry medicine admissions test used in Australia, the UK and Ireland.
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.
GAMSAT practice topics
| Topic | Section | Question source |
|---|---|---|
| Biology | Science | Question bank |
| Chemistry | Science | Calculated + question bank |
| Physics | Science | Calculated + question bank |
| Verbal Reasoning & Analogies | Reasoning | Calculated + question bank |