Free Atomic Structure MCQs with Answers
922 Atomic Structure MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
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922 questions · page 32 of 47
621. The only group of lines occurring in the visible region of the hydrogen spectrum is labeled as the
- A. Paschen series
- B. Pfund series
- C. Balmer series
- D. Lyman series
Explanation: The Balmer series involves electron transitions to the n=2 level, resulting in visible light emissions.
Correct answer: Balmer series- A. Eight
- B. Six
- C. Five
- D. Four
Explanation: Correct. The four quantum numbers are the principal (n), azimuthal (l), magnetic (ml), and spin (ms) quantum numbers.
Correct answer: Four- A. -2, -3, -1, 0, +2, +3, +1, +4
- B. -2, -3, -1, 0, +2, +3, +1
- C. -3, -4, -2, -1, 0, +4, +3, +2, +1
- D. -3, -2, -1, 0, +1, +2, +3
Explanation: -3, -2, -1, 0, +1, +2, +3 - Correct. This includes all valid values for mₗ (-3 to +3) for an f-orbital.
Correct answer: -3, -2, -1, 0, +1, +2, +3- A. 7,5
- B. 5, 7
- C. 7,6
- D. 9,6
Explanation: The value of n + l helps determine the energy level of orbitals.For 4f: n = 4, l = 3 → n + l = 4 + 3 = 7For 5p: n = 5, l = 1 → n + l = 5 +…
Correct answer: 7,6- A. 2
- B. 3
- C. 5
- D. 7
Explanation: 3) - Correct: p-subshell has three orbitals of equal energy
Correct answer: 3- A. 10 torr
- B. 1 torr
- C. 0.1 torr
- D. 0.01 torr
Explanation: 0.01 torr) - Correct: Best pressure for cathode ray formation. For the production of cathode rays, the gas pressure in the discharge tube…
Correct answer: 0.01 torr- A. E =hcv
- B. E = c/v
- C. E = hv
- D. None of these options are correct
Explanation: In chemistry, Frequency is denoted by vSo, the Planck's quantum theory isE = hv where h is the Planck's constantIt can be rewritten asE =…
Correct answer: E = hv- A. Heisenberg's uncertainty principle
- B. Aufbau Principle
- C. Pauli's Exclusion principle
- D. Hund's Rule
- E. (n+1) Rule
Explanation: The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers.
Correct answer: Pauli's Exclusion principle- A. Li & Fe
- B. Na & Cr
- C. K & Mn
- D. H & He
Explanation: Na electron configuration is 1s2 2s2 2p6 3s1. Cr electron configuration is [Ar] 3d⁵ 4s¹.
Correct answer: Na & Cr- A. 4s
- B. 2p
- C. 3d
- D. 1s
Explanation: According to the diagram below, 3d orbital should be filled before 4p, that is why option C is correct.
Correct answer: 3d- A. Planks
- B. Bohr
- C. Rutherford
- D. Einstein
Explanation: According to Planck's theory, energy is not emitted or absorbed continuously, but in discrete packets or quanta.
Correct answer: Bohr- A. n = 2
- B. n = 3
- C. n = 4
- D. n = 5
Explanation: Option A is wrong because n=2 will not be the higher orbit. Option B is wrong because n=3 will not be the higher orbit.
Correct answer: n = 4- A. Freezed, continuous
- B. Freezed, line
- C. Volatilized, line
- D. Volatilized, continuous
Explanation: The four stages of mass spectrometry are - ionization, acceleration, deflection, and detection.
Correct answer: Volatilized, line- A. Slower, Smaller
- B. Faster, Smaller
- C. Faster, Bigger
- D. Slower, Bigger
Explanation: Option B is correct since the radius of the moving electron is inversely proportional to the square of its velocity.
Correct answer: Faster, Smaller- A. Decrease
- B. Increase
- C. Remain the same
- D. May or may not remain the same
Explanation: For a given atom, the s orbitals also become higher in energy as n increases because of their increased distance from the nucleus.
Correct answer: Increase- A. In continuous manner
- B. In discontinuous manner
- C. Simultaneously
- D. In the form of heat
Explanation: According to Planck's quantum theory, there is no continuous emission or absorption of energy.
Correct answer: In discontinuous manner- A. 100% due to the forces of attraction
- B. Zero for all elements
- C. Finite for all elements
- D. Zero for some elements and finite for others
Explanation: "Zero for all elements" aligns with the principles of quantum mechanics.
Correct answer: Zero for all elements- A. [Ar] 3d9,4s2
- B. [Ar] 3d8,4s2
- C. [Ar] 3d9,4s1
- D. [Ar] 3d9,4s0
Explanation: The electronic configuration of Cu+2 (Copper ion with a +2 charge) can be determined by removing two electrons from the neutral copper…
Correct answer: [Ar] 3d9,4s0- A. Cu2+>Ni2+>Cr3+>Fe3+
- B. Fe3+>Cr3+>Cu2+>Ni2+
- C. Ni2+>Cu2+>Fe3+> Cr3+
- D. Fe3+>Cr3+> Ni2+>Cu2+
Explanation: Fe+3=5 unpaired electrons Cr+3=3 unpaired electrons Ni+2=2 unpaired electrons Cu+2=2 unpaired electrons So the order of number of unpaired…
Correct answer: Fe3+>Cr3+> Ni2+>Cu2+- A. Principal quantum no.
- B. Magnetic quantum no.
- C. Azimuthal quantum no.
- D. Quantum no.
Explanation: Principle quantum number tells us about the energy levels or shells ,hence this is the correct option.
Correct answer: Principal quantum no.