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AP Chemistry AP Chemistry Practice Test 2025

AP ChemistryModel questions
100marks
195min
10questions

This is the official AP Chemistry AP Chemistry question paper for 2025, as set in the Model questions examination. It carries 100 full marks and a time allowance of 195 minutes, across 10 questions. On Kekkei you can attempt this AP Chemistry past paper online with a timer, get instant AI feedback and step-by-step solutions, and track the topics where you lose marks — completely free. Whether you are revising for your AP Chemistry AP Chemistry exam or solving previous years' question papers, this 2025 paper is a great way to practise under real exam conditions.

LevelAP Chemistry
SubjectAP Chemistry
Year2025 BS
Exam sessionModel questions
Full marks100
Time allowed195 minutes
Questions10, all with step-by-step solutions
A

Multiple Choice

Select the best answer.

10 questions·1 mark each
1Multiple choice1 mark

Ground-state electron configuration for Fe (Z=26Z=26)?

  • a
    [Ar] 3d8[\text{Ar}]\,3d^8
  • b
    [Ar] 4s2 3d6[\text{Ar}]\,4s^2\,3d^6
  • c
    [Ar] 4s1 3d7[\text{Ar}]\,4s^1\,3d^7
  • d
    [Ar] 4s2 3d8[\text{Ar}]\,4s^2\,3d^8
Correct answer: b
[Ar] 4s2 3d6[\text{Ar}]\,4s^2\,3d^6

[Ar] 4s2 3d6[\text{Ar}]\,4s^2\,3d^6.

The correct answer is (b).

atomic-structureelectron-configuration
2Multiple choice1 mark

Molecular geometry of SF4\text{SF}_4 (VSEPR)?

  • a

    Tetrahedral

  • b

    Square planar

  • c

    Seesaw

  • d

    Trigonal bipyramidal

Correct answer: c

Seesaw

4 bonding pairs + 1 lone pair = seesaw.

The correct answer is (c) Seesaw.

bondingmolecular-geometry
3Multiple choice1 mark

2Al+3Cl2→2AlCl32\text{Al}+3\text{Cl}_2\to 2\text{AlCl}_3. 5.4 g Al (27) + 21.3 g Cl2_2 (71). Limiting reagent?

  • a

    Al

  • b

    Cl2_2

  • c

    Both

  • d

    Neither; exact stoichiometric proportion

Correct answer: d

Neither; exact stoichiometric proportion

Moles: Al=0.20, Cl2_2=0.30. Ratio 0.20/2=0.30/3=0.10. Exact proportion.

The correct answer is (d).

stoichiometrylimiting-reagent
4Multiple choice1 mark

C+O$_2

\to$CO$_2$, $\Delta H_1=-393.5$ kJ. CO+$\frac{1}{2}$O$_2

\toCOCO_2,, \Delta H_2=-283.0kJ.kJ.\Delta HforC+ for C+\frac{1}{2}OO_2$$\to$CO?

  • a

    $$-110.5kJ kJ

  • b

    $$-676.5kJ kJ

  • c

    $$+110.5kJ kJ

  • d

    $$-283.0kJ kJ

Correct answer: a

$$-110.5kJ kJ

ΔH=−393.5−(−283.0)=−110.5\Delta H=-393.5-(-283.0)=-110.5 kJ.

The correct answer is (a).

thermodynamicsenthalpy
5Multiple choice1 mark

A+2B→CA+2B\to C. Doubling [A] doubles rate; doubling [B] quadruples rate. Rate law?

  • a

    Rate =k[A]2[B]=k[A]^2[B]

  • b

    Rate =k[A][B]=k[A][B]

  • c

    Rate =k[A][B]2=k[A][B]^2

  • d

    Rate =k[A]2[B]2=k[A]^2[B]^2

Correct answer: c

Rate =k[A][B]2=k[A][B]^2

First order in A, second in B.

The correct answer is (c) Rate =k[A][B]2=k[A][B]^2.

kineticsrate-law
6Multiple choice1 mark

N2_2+3H_2$$\rightleftharpoons2NH3_3 (exothermic). How to make more NH3_3?

  • a

    Increase temperature

  • b

    Increase pressure by decreasing volume

  • c

    Add a catalyst

  • d

    Remove N2_2

Correct answer: b

Increase pressure by decreasing volume

Increase pressure (decrease volume) shifts to fewer gas moles (products).

The correct answer is (b).

equilibriumle-chatelier
7Multiple choice1 mark

pH of 0.010 M HCl?

  • a

    1.00

  • b

    2.00

  • c

    3.00

  • d

    12.00

Correct answer: b

2.00

[H+]=0.010[\text{H}^+]=0.010. pH=2.00=2.00.

The correct answer is (b) 2.00.

acids-basesph-calculation
8Multiple choice1 mark

E∘E^\circ(Cu2+^{2+}/Cu)=+0.34=+0.34 V, E∘E^\circ(Zn2+^{2+}/Zn)=−0.76=-0.76 V. Cell potential for Zn|Zn2+^{2+}||Cu2+^{2+}|Cu?

  • a

    +0.42 V

  • b

    +0.76 V

  • c

    +1.00 V

  • d

    +1.10 V

Correct answer: d

+1.10 V

E∘=0.34−(−0.76)=1.10E^\circ=0.34-(-0.76)=1.10 V.

The correct answer is (d) +1.10 V.

electrochemistrycell-potential
9Multiple choice1 mark

Highest boiling point: CH4_4, NH3_3, H2_2O, or HF?

  • a

    CH4_4

  • b

    NH3_3

  • c

    H2_2O

  • d

    HF

Correct answer: c

H2_2O

H2_2O has extensive H-bonding network. bp=100 C.

The correct answer is (c) H2_2O.

bondingintermolecular-forces
10Multiple choice1 mark

Moles NaOH to neutralize 250 mL of 0.40 M H2_2SO4_4?

  • a

    0.20 mol

  • b

    0.10 mol

  • c

    0.40 mol

  • d

    0.050 mol

Correct answer: a

0.20 mol

n=2(0.25)(0.40)=0.20n=2(0.25)(0.40)=0.20 mol.

The correct answer is (a) 0.20 mol.

stoichiometrymolarity

Frequently asked questions

Where can I find the AP Chemistry AP Chemistry question paper 2025?
The full AP Chemistry AP Chemistry 2025 (Model questions) question paper is available free on Kekkei. You can read every question online and attempt the paper under timed exam conditions.
Does the AP Chemistry 2025 paper come with solutions?
Yes. Every question on this AP Chemistry past paper includes a step-by-step solution, plus instant AI feedback when you attempt it on Kekkei.
How many marks is the AP Chemistry AP Chemistry 2025 paper?
The AP Chemistry AP Chemistry 2025 paper carries 100 full marks and is meant to be completed in 195 minutes, across 10 questions.
Is practising this AP Chemistry past paper free?
Yes — reading and attempting this AP Chemistry past paper on Kekkei is completely free.