AP CHEMISTRY FINAL EXAM 2026 QUESTIONS
WITH ANSWERS GRADED A+
◉ (A) CO2 (B) H2O (C) CH4 (D) C2H4 (E) PH3
3. The molecule with only one double bond
4. The molecule with the largest dipole moment
5. The molecule that has trigonal pyramidal geome¬try. Answer: 3. D
4. B
5. E
◉ (A) PbSO4 (B) CuO (C) KMnO4 (D) KCl (E) FeCl3
6. Is purple in aqueous solution
7. Is white and very soluble in water. Answer: 6. C
7. D
◉ (A) Ne (B) Xe (C) O2 (D) CO (E) NO
8. Has an average atomic or molecular speed closest to that of N2
molecules at 0˚C and 1 atm
,9. Has the greatest density
10. Has the greatest rate of effusion through a pin¬hole. Answer: 8. D
9. B
10. A
◉ 17. In which of the following groups are the three species
isoelectronic; i.e., have the same number of electrons?
(A) S2-, K+, Ca2+ (B) Sc, Ti, V2+ (C) O2-, S2-, Cl¬-
(D) Mg2+, Ca2+, Sr2+ (E) Cs, Ba2+, La3+. Answer: 17. A
◉ 19. In which of the following species does sulfur have the same
oxidation number as it does in H2SO4?
(A) H2SO3 (B) S2O32- (C) S2- (D) S8 (E) SO2Cl2. Answer: 19. E
◉ 20. A flask contains 0.25 mole of SO2(g), 0.50 mole of CH4(g), and
0.50 mole of O2(g). The total pressure of the gases in the flask is 800
mm Hg. What is the partial pressure of the SO2(g) in the flask?
(A) 800 mm Hg (B) 600 mm Hg (C) 250 mm Hg (D) 200 mm Hg (E)
160 mm Hg. Answer: 20. E
◉ 21. In the laboratory, H2(g) can be produced by adding which of the
following to 1 M HCl(aq)?
I. 1 M NH3(aq) II. Zn(s) III. NaHCO3(s)
, (A) I only (B) II only (C) III only (D) I and II only (E) I, II, and Ill.
Answer: 21. B
◉ 2 NH3 NH4+ + NH2-
22. In liquid ammonia, the reaction represented above occurs. In the
reaction NH4+ acts as
(A) a catalyst (B) both an acid and a base
(C) the conjugate acid of NH3 (D) the reducing agent
(E) the oxidizing agent. Answer: 22. C
◉ 24. A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol
of 0. What is the simplest formula of this compound?
(A) KTeO (B) KTe2O (C) K2TeO3 (D) K2TeO6 (E) K4TeO6. Answer:
24. C
◉ 26. Approximately what mass of CuSO4•5H2O (250 g mol-1) is
required to prepare 250 mL of 0.10 M copper(II) sulfate solution?
(A) 4.0 g (B) 6.2 g (C) 34 g (D) 85 g (E) 140 g. Answer: 26. B
◉ 2 NO(g) + O2(g) → 2 NO2(g)
27. A possible mechanism for the overall reaction represented above is
the following.
(1) NO(g) + NO(g) → N2O2(g) slow
(2) N2O2(g) + O2(g) → 2 NO2(g) fast
WITH ANSWERS GRADED A+
◉ (A) CO2 (B) H2O (C) CH4 (D) C2H4 (E) PH3
3. The molecule with only one double bond
4. The molecule with the largest dipole moment
5. The molecule that has trigonal pyramidal geome¬try. Answer: 3. D
4. B
5. E
◉ (A) PbSO4 (B) CuO (C) KMnO4 (D) KCl (E) FeCl3
6. Is purple in aqueous solution
7. Is white and very soluble in water. Answer: 6. C
7. D
◉ (A) Ne (B) Xe (C) O2 (D) CO (E) NO
8. Has an average atomic or molecular speed closest to that of N2
molecules at 0˚C and 1 atm
,9. Has the greatest density
10. Has the greatest rate of effusion through a pin¬hole. Answer: 8. D
9. B
10. A
◉ 17. In which of the following groups are the three species
isoelectronic; i.e., have the same number of electrons?
(A) S2-, K+, Ca2+ (B) Sc, Ti, V2+ (C) O2-, S2-, Cl¬-
(D) Mg2+, Ca2+, Sr2+ (E) Cs, Ba2+, La3+. Answer: 17. A
◉ 19. In which of the following species does sulfur have the same
oxidation number as it does in H2SO4?
(A) H2SO3 (B) S2O32- (C) S2- (D) S8 (E) SO2Cl2. Answer: 19. E
◉ 20. A flask contains 0.25 mole of SO2(g), 0.50 mole of CH4(g), and
0.50 mole of O2(g). The total pressure of the gases in the flask is 800
mm Hg. What is the partial pressure of the SO2(g) in the flask?
(A) 800 mm Hg (B) 600 mm Hg (C) 250 mm Hg (D) 200 mm Hg (E)
160 mm Hg. Answer: 20. E
◉ 21. In the laboratory, H2(g) can be produced by adding which of the
following to 1 M HCl(aq)?
I. 1 M NH3(aq) II. Zn(s) III. NaHCO3(s)
, (A) I only (B) II only (C) III only (D) I and II only (E) I, II, and Ill.
Answer: 21. B
◉ 2 NH3 NH4+ + NH2-
22. In liquid ammonia, the reaction represented above occurs. In the
reaction NH4+ acts as
(A) a catalyst (B) both an acid and a base
(C) the conjugate acid of NH3 (D) the reducing agent
(E) the oxidizing agent. Answer: 22. C
◉ 24. A compound contains 1.10 mol of K, 0.55 mol of Te, and 1.65 mol
of 0. What is the simplest formula of this compound?
(A) KTeO (B) KTe2O (C) K2TeO3 (D) K2TeO6 (E) K4TeO6. Answer:
24. C
◉ 26. Approximately what mass of CuSO4•5H2O (250 g mol-1) is
required to prepare 250 mL of 0.10 M copper(II) sulfate solution?
(A) 4.0 g (B) 6.2 g (C) 34 g (D) 85 g (E) 140 g. Answer: 26. B
◉ 2 NO(g) + O2(g) → 2 NO2(g)
27. A possible mechanism for the overall reaction represented above is
the following.
(1) NO(g) + NO(g) → N2O2(g) slow
(2) N2O2(g) + O2(g) → 2 NO2(g) fast
