Quantum Chemistry and Group Theory

JKPSC Assistant Professor (Chemistry) · Chemistry · 60 practice questions with answers and explanations: 5 Easy, 55 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The number of electrons that can occupy a p subshell is:

  1. 6
  2. 10
  3. 14
  4. 2
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Answer: A. A p subshell has three orbitals holding two electrons each.

Sample Easy question 2

The shape of an s orbital is:

  1. Spherical
  2. Planar
  3. Double dumbbell
  4. Dumbbell
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Answer: A. All s orbitals are spherical.

Sample Easy question 3

The principal quantum number n describes the:

  1. Orientation of the orbital
  2. Shape of the orbital
  3. Energy level (shell)
  4. Spin of the electron
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Answer: C. The values are 1, 2, 3 and so on.

Sample Medium question 4

First-order perturbation theory gives the correction as:

  1. Zero
  2. The ground energy
  3. The sum of all states
  4. The expectation value of the perturbation
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Answer: D. E¹ = ⟨ψ⁰∣H′∣ψ⁰⟩.

Sample Medium question 5

The term symbol for the ground state of the carbon atom is:

  1. ³P₂
  2. ¹D₂
  3. ¹S₀
  4. ³P₀
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Answer: D. It follows Hund's rules.

Sample Medium question 6

The ground state term symbol of the hydrogen atom is:

  1. ³P₀
  2. ²P₁/₂
  3. ¹S₀
  4. ²S₁/₂
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Answer: D. It has one electron in 1s.

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