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AP Chemistry Chemistry Questions
Practise chemistry (science) for the AP Chemistry: 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.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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Q2.What is the pH of a solution with [OH⁻] = 10⁻² mol/L at 25 °C?
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Answer: C — 12
[OH⁻] = 10⁻² → pOH = 2; pH = 14 − 2 = 12 (at 25 °C).
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Q3.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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Q4.What is the pH of a solution with [H⁺] = 10⁻⁵ mol/L?
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Answer: D — 5
pH = −log[H⁺] = −log(10⁻⁵) = 5.
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Q5.Rusting of iron requires:
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Answer: B — Both oxygen and water
Iron rusts in the presence of oxygen and moisture, forming hydrated iron(III) oxide.
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Q6.What is the mass of 2 mol of ammonia (NH₃)? (Molar mass 17 g/mol)
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Answer: D — 34 g
Mass = moles × molar mass = 2 × 17 g/mol = 34 g.
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Q7.Which element is liquid at room temperature?
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Answer: C — Mercury
Mercury (and bromine) are liquids at room temperature.
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Q8.58.5 g of glucose (molar mass 180) is dissolved to make 2000 mL of solution. Find the molarity.
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Answer: C — 0.163 M
Moles = 58.5/180 = 0.325; molarity = moles ÷ litres = 0.325 ÷ 2 = 0.163 M.
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Q9.Which is the most electronegative element?
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Answer: B — Fluorine
Fluorine has the highest electronegativity (3.98 on the Pauling scale).
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Q10.Isotopes of an element have the same number of:
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Answer: D — Protons
Isotopes share the proton number but differ in neutrons.
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 AP Chemistry
AP Chemistry — conducted by College Board. College-level chemistry: atomic structure, bonding, stoichiometry, equilibrium and acids & bases.
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.
AP Chemistry practice topics
| Topic | Section | Question source |
|---|---|---|
| Chemistry | Science | Calculated + question bank |