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AP Chemistry Practice Questions
Original practice questions for the AP Chemistry (College Board), mixed across 1 topics with instant answers and explanations. Practise by topic below or take the timed mock test.
AP Chemistry mixed practice
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Q1.Which is the most electronegative element?
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Answer: A — Fluorine
Fluorine has the highest electronegativity (3.98 on the Pauling scale).
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Q2.8 g of NaOH (molar mass 40) is dissolved to make 500 mL of solution. Find the molarity.
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Answer: A — 0.4 M
Moles = 8/40 = 0.2; molarity = moles ÷ litres = 0.2 ÷ 0.5 = 0.4 M.
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Q3.The noble gas used in advertising signs that glows red-orange is:
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Answer: A — Neon
Neon glows red-orange in discharge tubes.
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Q4.90 g of glucose (molar mass 180) is dissolved to make 500 mL of solution. Find the molarity.
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Answer: B — 1 M
Moles = 90/180 = 0.5; molarity = moles ÷ litres = 0.5 ÷ 0.5 = 1 M.
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Q5.Which gas is produced when zinc reacts with dilute hydrochloric acid?
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Answer: A — Hydrogen
Zn + 2HCl → ZnCl₂ + H₂.
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Q6.What is the mass of 3 mol of methane (CH₄)? (Molar mass 16 g/mol)
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Answer: B — 48 g
Mass = moles × molar mass = 3 × 16 g/mol = 48 g.
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Q7.The periodic table is arranged in order of increasing:
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Answer: D — Atomic number
The modern periodic table orders elements by atomic number.
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Q8.8 g of HCl (molar mass 36.5) is dissolved to make 2000 mL of solution. Find the molarity.
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Answer: B — 0.11 M
Moles = 8/36.5 = 0.219; molarity = moles ÷ litres = 0.219 ÷ 2 = 0.11 M.
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Q9.Isotopes of an element have the same number of:
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Answer: B — Protons
Isotopes share the proton number but differ in neutrons.
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Q10.What is the mass of 1 mol of calcium carbonate (CaCO₃)? (Molar mass 100 g/mol)
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Answer: A — 100 g
Mass = moles × molar mass = 1 × 100 g/mol = 100 g.
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.
Practise by topic
- Chemistry questions — Moles = mass ÷ molar mass; molarity = moles ÷ litres.
- AP Chemistry mock test — 25 timed questions.
AP Chemistry practice topics
| Topic | Section | Question source |
|---|---|---|
| Chemistry | Science | Calculated + question bank |