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AP Chemistry Mock Test
A timed 25-question mock for the AP Chemistry covering chemistry. Answer, submit and review every question with its explanation; set negative marking to match your exam’s current scheme.
AP Chemistry mock test
25 questions · 1 mark each · the timer starts with your first answer and the test submits itself when time runs out.
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Q1.The hardest naturally occurring substance is:
Answer: D — Diamond
Diamond, a carbon allotrope, is the hardest natural material.
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Q2.What is the mass of 1.5 mol of ammonia (NH₃)? (Molar mass 17 g/mol)
Answer: C — 25.5 g
Mass = moles × molar mass = 1.5 × 17 g/mol = 25.5 g.
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Q3.Water has a maximum density at about:
Answer: A — 4 °C
Water is densest at about 4 °C.
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Q4.What is the mass of 1 mol of methane (CH₄)? (Molar mass 16 g/mol)
Answer: D — 16 g
Mass = moles × molar mass = 1 × 16 g/mol = 16 g.
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Q5.A solution with pH 3 is:
Answer: B — Acidic
pH below 7 is acidic.
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Q6.What is the mass of 2 mol of glucose (C₆H₁₂O₆)? (Molar mass 180 g/mol)
Answer: D — 360 g
Mass = moles × molar mass = 2 × 180 g/mol = 360 g.
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Q7.Which bond is formed by the sharing of electrons?
Answer: C — Covalent
Covalent bonds share electron pairs.
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Q8.40 g of NaCl (molar mass 58.5) is dissolved to make 1000 mL of solution. Find the molarity.
Answer: B — 0.684 M
Moles = 40/58.5 = 0.684; molarity = moles ÷ litres = 0.684 ÷ 1 = 0.684 M.
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Q9.Which gas is produced when zinc reacts with dilute hydrochloric acid?
Answer: C — Hydrogen
Zn + 2HCl → ZnCl₂ + H₂.
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Q10.4 g of KCl (molar mass 74.5) is dissolved to make 500 mL of solution. Find the molarity.
Answer: B — 0.107 M
Moles = 4/74.5 = 0.054; molarity = moles ÷ litres = 0.054 ÷ 0.5 = 0.107 M.
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Q11.Which is the most electronegative element?
Answer: D — Fluorine
Fluorine has the highest electronegativity (3.98 on the Pauling scale).
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Q12.What is the mass of 0.5 mol of glucose (C₆H₁₂O₆)? (Molar mass 180 g/mol)
Answer: D — 90 g
Mass = moles × molar mass = 0.5 × 180 g/mol = 90 g.
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Q13.An oxidation reaction involves:
Answer: C — Loss of electrons
Oxidation is loss of electrons (OIL RIG).
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Q14.What is the mass of 1.5 mol of methane (CH₄)? (Molar mass 16 g/mol)
Answer: D — 24 g
Mass = moles × molar mass = 1.5 × 16 g/mol = 24 g.
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Q15.The periodic table is arranged in order of increasing:
Answer: A — Atomic number
The modern periodic table orders elements by atomic number.
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Q16.What is the pH of a solution with [H⁺] = 10⁻¹ mol/L?
Answer: D — 1
pH = −log[H⁺] = −log(10⁻¹) = 1.
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Q17.The chemical formula of common salt is:
Answer: A — NaCl
Common salt is sodium chloride.
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Q18.10 g of glucose (molar mass 180) is dissolved to make 1000 mL of solution. Find the molarity.
Answer: B — 0.056 M
Moles = 10/180 = 0.056; molarity = moles ÷ litres = 0.056 ÷ 1 = 0.056 M.
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Q19.Isotopes of an element have the same number of:
Answer: B — Protons
Isotopes share the proton number but differ in neutrons.
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Q20.The noble gas used in advertising signs that glows red-orange is:
Answer: A — Neon
Neon glows red-orange in discharge tubes.
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Q21.36.5 g of NaOH (molar mass 40) is dissolved to make 500 mL of solution. Find the molarity.
Answer: C — 1.825 M
Moles = 36.5/40 = 0.913; molarity = moles ÷ litres = 0.913 ÷ 0.5 = 1.825 M.
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Q22.The process of converting a solid directly into a gas is called:
Answer: B — Sublimation
Sublimation, e.g. dry ice or naphthalene.
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Q23.40 g of KCl (molar mass 74.5) is dissolved to make 2000 mL of solution. Find the molarity.
Answer: A — 0.268 M
Moles = 40/74.5 = 0.537; molarity = moles ÷ litres = 0.537 ÷ 2 = 0.268 M.
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Q24.The main component of natural gas is:
Answer: D — Methane
Methane (CH₄).
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Q25.What is the mass of 3 mol of sodium chloride (NaCl)? (Molar mass 58.5 g/mol)
Answer: D — 175.5 g
Mass = moles × molar mass = 3 × 58.5 g/mol = 175.5 g.
How the mock test works
- The timer starts with your first answer; the test submits itself when time runs out.
- Choose the negative marking that matches your exam (this test has no negative marking by default — check the official notification).
- After submitting you get your score, accuracy, time taken and a topic-wise breakdown, then every explanation.
- “New mock test” builds another paper — calculation questions get new numbers.
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 |