Selected MCQ

Current Question
Which molecule is nonpolar?
  • A. NH₃
  • B. H₂O
  • C. CO₂
  • D. SO₂
Correct Answer: C
Explanation:
Linear geometry cancels dipoles.
Related Question 1
Which molecule carries oxygen in muscle?
  • A. Hemoglobin
  • B. Myoglobin
  • C. Collagen
  • D. Keratin
Correct Answer: B
Explanation:
Myoglobin stores oxygen in muscle.
Related Question 2
Which molecule carries amino acids?
  • A. mRNA
  • B. rRNA
  • C. tRNA
  • D. DNA
Correct Answer: C
Explanation:
tRNA transports amino acids.
Related Question 3
Which molecule has highest dipole moment?
  • A. CO₂
  • B. NH₃
  • C. CH₄
  • D. BF₃
Correct Answer: B
Explanation:
NH₃ is polar with lone pair.
Related Question 4
Which reaction type forms larger molecule from smaller ones?
  • A. Decomposition
  • B. Addition
  • C. Substitution
  • D. Elimination
Correct Answer: B
Explanation:
Addition combines molecules.
Related Question 5
Which molecule exhibits dipole moment?
  • A. CO₂
  • B. BF₃
  • C. NH₃
  • D. CH₄
Correct Answer: C
Explanation:
NH₃ is polar due to lone pair.