AB MT Chemistry Exam I Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the correct electron configuration for
oxygen?
A. 1s² 2s² 2p⁴
B. 1s² 2s² 2p⁶
C. 1s² 2s¹ 2p⁵
D. 1s² 2s² 2p³
A
Oxygen has 8 electrons: 2 in the 1s orbital, 2 in the 2s orbital, and
4 in the 2p orbital.
2. The molar mass of CaCl₂ is:
A. 58.44 g/mol
B. 110.98 g/mol
C. 147.01 g/mol
D. 100.98 g/mol
C
Calcium = 40.08, Chlorine = 35.45 ×2 → 40.08 + 70.90 = 110.98
g/mol.
3. A catalyst:
A. Is consumed in a reaction
, B. Increases the reaction rate without being consumed
C. Lowers the temperature of the reaction
D. Changes the products
B
Catalysts provide an alternate reaction pathway with lower
activation energy and are not consumed.
4. Which of the following acids is strong?
A. HF
B. HCl
C. H₂CO₃
D. CH₃COOH
B
HCl is a strong acid because it dissociates completely in water.
5. The pH of a 0.01 M HCl solution is:
A. 1
B. 2
C. 3
D. 4
B
HCl is a strong acid. pH = -log[H⁺] → -log(0.01) = 2.
6. The empirical formula of a compound containing 40% C, 6.7% H,
and 53.3% O is:
A. CHO
B. C₂H₂O₂
C. CH₂O
D. C₃H₆O₃
C
, Convert percentages to moles: C:40/12=3.33, H:6.7/1=6.7,
O:53.3/16=3.33 → ratio ~1:2:1.
7. Which gas is most soluble in water at 25°C?
A. O₂
B. CO₂
C. N₂
D. H₂
B
CO₂ reacts with water to form carbonic acid, increasing solubility.
8. The electron geometry of NH₃ is:
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Bent
C
Nitrogen has 3 bonding pairs and 1 lone pair → tetrahedral
electron geometry.
9. Which of the following is a redox reaction?
A. HCl + NaOH → NaCl + H₂O
B. Zn + CuSO₄ → ZnSO₄ + Cu
C. H₂CO₃ → H₂O + CO₂
D. AgNO₃ + NaCl → AgCl + NaNO₃
B
Zn is oxidized (Zn → Zn²⁺) and Cu²⁺ is reduced (Cu²⁺ → Cu).
10. Which of the following compounds is ionic?
A. CO₂
B. NaCl
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the correct electron configuration for
oxygen?
A. 1s² 2s² 2p⁴
B. 1s² 2s² 2p⁶
C. 1s² 2s¹ 2p⁵
D. 1s² 2s² 2p³
A
Oxygen has 8 electrons: 2 in the 1s orbital, 2 in the 2s orbital, and
4 in the 2p orbital.
2. The molar mass of CaCl₂ is:
A. 58.44 g/mol
B. 110.98 g/mol
C. 147.01 g/mol
D. 100.98 g/mol
C
Calcium = 40.08, Chlorine = 35.45 ×2 → 40.08 + 70.90 = 110.98
g/mol.
3. A catalyst:
A. Is consumed in a reaction
, B. Increases the reaction rate without being consumed
C. Lowers the temperature of the reaction
D. Changes the products
B
Catalysts provide an alternate reaction pathway with lower
activation energy and are not consumed.
4. Which of the following acids is strong?
A. HF
B. HCl
C. H₂CO₃
D. CH₃COOH
B
HCl is a strong acid because it dissociates completely in water.
5. The pH of a 0.01 M HCl solution is:
A. 1
B. 2
C. 3
D. 4
B
HCl is a strong acid. pH = -log[H⁺] → -log(0.01) = 2.
6. The empirical formula of a compound containing 40% C, 6.7% H,
and 53.3% O is:
A. CHO
B. C₂H₂O₂
C. CH₂O
D. C₃H₆O₃
C
, Convert percentages to moles: C:40/12=3.33, H:6.7/1=6.7,
O:53.3/16=3.33 → ratio ~1:2:1.
7. Which gas is most soluble in water at 25°C?
A. O₂
B. CO₂
C. N₂
D. H₂
B
CO₂ reacts with water to form carbonic acid, increasing solubility.
8. The electron geometry of NH₃ is:
A. Linear
B. Trigonal planar
C. Tetrahedral
D. Bent
C
Nitrogen has 3 bonding pairs and 1 lone pair → tetrahedral
electron geometry.
9. Which of the following is a redox reaction?
A. HCl + NaOH → NaCl + H₂O
B. Zn + CuSO₄ → ZnSO₄ + Cu
C. H₂CO₃ → H₂O + CO₂
D. AgNO₃ + NaCl → AgCl + NaNO₃
B
Zn is oxidized (Zn → Zn²⁺) and Cu²⁺ is reduced (Cu²⁺ → Cu).
10. Which of the following compounds is ionic?
A. CO₂
B. NaCl
