INTRODUCTORY TO CHEMISTRY EXAM 2 : FREQUENTLY
TESTED 50+ MCQS WITH DETAILED RATIONALES /GRADED
A+ / GUARANTEED PASS
General Chemistry
1. A solution has a pH of 13.20. We can conclude that:
A) The solution is very acidic.
B) The solution is only slightly acidic.
C) The solution is only slightly basic.
D) The solution is very basic.
Answer: D) The solution is very basic.
Explanation: pH values above 7 indicate basic solutions, and pH > 12 is considered
strongly basic.
2. A solution has a pOH of 1.47. This tells us:
A) The solution is very acidic.
B) The solution is only slightly acidic.
C) The solution is only slightly basic.
D) The solution is very basic.
Answer: D) The solution is very basic.
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,Explanation: pOH = 1.47 corresponds to [OH⁻] ≈ 0.034 M, which is a relatively high
concentration of hydroxide ions.
3. Aluminum chloride (AlCl₃) in the gas phase has how many electron domains on the
central Al atom?
A) 3
B) 4
C) 6
D) 8
Answer: A) 3
Explanation: In the gas phase, AlCl₃ has a trigonal planar geometry with 3 electron
domains (from the 3 Cl atoms).
4. How many valence electrons does aluminum (Al) have?
A) 1
B) 3
C) 5
D) 7
Answer: B) 3
Explanation: Aluminum's electron configuration is [Ne]3s²3p¹, giving it 3 valence
electrons.
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, 5. The molecular geometry of AlCl₃ in the gas phase is:
A) T-shaped
B) Trigonal pyramidal
C) Tetrahedral
D) Trigonal planar
Answer: D) Trigonal planar
Explanation: With 3 bonding pairs and no lone pairs, AlCl₃ adopts a trigonal planar
geometry.
Stoichiometry
6. An unknown compound contains 0.1935 g C, 0.0325 g H, and 0.2043 g F. Its empirical
formula is:
A) C₃H₅F
B) C₃H₂F₃
C) C₂H₆F₂
D) C₃H₆F₂
Answer: D) C₃H₆F₂
Explanation: The mole ratios are C:H:F ≈ 1.5:3:1, which simplifies to C₃H₆F₂.
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TESTED 50+ MCQS WITH DETAILED RATIONALES /GRADED
A+ / GUARANTEED PASS
General Chemistry
1. A solution has a pH of 13.20. We can conclude that:
A) The solution is very acidic.
B) The solution is only slightly acidic.
C) The solution is only slightly basic.
D) The solution is very basic.
Answer: D) The solution is very basic.
Explanation: pH values above 7 indicate basic solutions, and pH > 12 is considered
strongly basic.
2. A solution has a pOH of 1.47. This tells us:
A) The solution is very acidic.
B) The solution is only slightly acidic.
C) The solution is only slightly basic.
D) The solution is very basic.
Answer: D) The solution is very basic.
Please leave a review. Your review is my motivation. Success in your Exams
,Explanation: pOH = 1.47 corresponds to [OH⁻] ≈ 0.034 M, which is a relatively high
concentration of hydroxide ions.
3. Aluminum chloride (AlCl₃) in the gas phase has how many electron domains on the
central Al atom?
A) 3
B) 4
C) 6
D) 8
Answer: A) 3
Explanation: In the gas phase, AlCl₃ has a trigonal planar geometry with 3 electron
domains (from the 3 Cl atoms).
4. How many valence electrons does aluminum (Al) have?
A) 1
B) 3
C) 5
D) 7
Answer: B) 3
Explanation: Aluminum's electron configuration is [Ne]3s²3p¹, giving it 3 valence
electrons.
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, 5. The molecular geometry of AlCl₃ in the gas phase is:
A) T-shaped
B) Trigonal pyramidal
C) Tetrahedral
D) Trigonal planar
Answer: D) Trigonal planar
Explanation: With 3 bonding pairs and no lone pairs, AlCl₃ adopts a trigonal planar
geometry.
Stoichiometry
6. An unknown compound contains 0.1935 g C, 0.0325 g H, and 0.2043 g F. Its empirical
formula is:
A) C₃H₅F
B) C₃H₂F₃
C) C₂H₆F₂
D) C₃H₆F₂
Answer: D) C₃H₆F₂
Explanation: The mole ratios are C:H:F ≈ 1.5:3:1, which simplifies to C₃H₆F₂.
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