Selected MCQ

Current Question
In molecular orbital theory, antibonding orbitals have:
  • A. Lower energy
  • B. Higher energy
  • C. Same energy
  • D. Zero energy
Correct Answer: B
Explanation:
Antibonding orbitals destabilize molecule.
Related Question 1
Which quantum number determines orbital shape?
  • A. Principal
  • B. Azimuthal
  • C. Magnetic
  • D. Spin
Correct Answer: B
Explanation:
Azimuthal quantum number defines orbital geometry.
Related Question 2
Which orbital hybridization is tetrahedral?
  • A. sp
  • B. sp²
  • C. sp³
  • D. dsp²
Correct Answer: C
Explanation:
sp³ gives tetrahedral geometry.
Related Question 3
Which orbital has highest energy in hydrogen atom?
  • A. 2s
  • B. 2p
  • C. 3s
  • D. All same for given n
Correct Answer: D
Explanation:
Energy depends only on n in hydrogen.
Related Question 4
Which orbital penetrates closest to nucleus?
  • A. 3p
  • B. 3d
  • C. 3s
  • D. 4f
Correct Answer: C
Explanation:
s orbitals have highest penetration.
Related Question 5
Which compound has strongest intermolecular forces?
  • A. CH₄
  • B. NH₃
  • C. H₂O
  • D. CO₂
Correct Answer: C
Explanation:
Water forms extensive hydrogen bonding network.