Selected MCQ

Current Question
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 1
Which element has highest ionization energy?
  • A. Na
  • B. Mg
  • C. Ar
  • D. K
Correct Answer: C
Explanation:
Noble gases have full shells and high ionization energy.
Related Question 2
Which system has highest internal energy?
  • A. Solid
  • B. Liquid
  • C. Gas
  • D. Vacuum
Correct Answer: C
Explanation:
Gas particles have highest kinetic energy.
Related Question 3
Which phenomenon leads to quantization of atomic energy levels?
  • A. Classical mechanics
  • B. Boundary conditions on wavefunctions
  • C. Thermal motion
  • D. Friction
Correct Answer: B
Explanation:
Allowed solutions of Schrödinger equation are discrete due to constraints.
Related Question 4
Which has highest lattice energy?
  • A. NaCl
  • B. MgO
  • C. KBr
  • D. CaCl₂
Correct Answer: B
Explanation:
Higher charge ions yield stronger attraction.
Related Question 5
Which energy source is sustainable?
  • A. Coal
  • B. Oil
  • C. Solar
  • D. Gas
Correct Answer: C
Explanation:
Solar is sustainable.