Selected MCQ

Current Question
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 1
Which orbital has zero probability at nucleus?
  • A. s
  • B. p
  • C. d
  • D. Both B and C
Correct Answer: D
Explanation:
p and d orbitals have nodes at the nucleus.
Related Question 2
Which force holds nucleus together?
  • A. Gravitational
  • B. Strong nuclear
  • C. Weak
  • D. Electric
Correct Answer: B
Explanation:
Strong force binds nucleons.
Related Question 3
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 4
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 5
Which orbital hybridization is tetrahedral?
  • A. sp
  • B. sp²
  • C. sp³
  • D. dsp²
Correct Answer: C
Explanation:
sp³ gives tetrahedral geometry.