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 17 of 47
- A. CI2 > C2H6 > CH4 > F2
- B. CI2 > F2 > CH4 > C2H6
- C. C2H6 > CH4 > F2 > CI2
- D. F2 > CH4 > C2H6 > CI2
Explanation: The boiling points of substances are related to their vapor pressures at a given temperature.
Correct answer: CI2 > F2 > CH4 > C2H6- A. boiling point of water will be 0 C at 5 mmHg
- B. boiling point of water will be 0 C
- C. if external pressure is 5 mmHg then water will boil at 0 C
- D. boiling point of water is 100 C at 760 mmHg pressure
Explanation: Explanation: The statement "Vapor pressure of water at 0 C is 5 mmHg" implies that at 0 degrees Celsius, the water vapor exerts a pressure…
Correct answer: if external pressure is 5 mmHg then water will boil at 0 C- A. Nucleus
- B. Electron
- C. Proton
- D. A-particle
Explanation: Rutherford's famous gold foil experiment in 1909 provided crucial insights into the structure of the atom.
Correct answer: Nucleus- A. 2n
- B. 2n2
- C. n2
- D. N+1
Explanation: The number of orbitals in a shell with principal quantum number 'n' can be calculated using the following formula:Number of orbitals =…
Correct answer: n2- A. A stream of electron
- B. Charged particles
- C. Move with speed as that of light
- D. Can be deflected by magnetic fields
Explanation: The statement that cathode rays move with the speed of light is not true.
Correct answer: Move with speed as that of light- A. Increase from top to bottom
- B. Decrease from top to bottom
- C. No effect
- D. None of these
Explanation: The electrochemical series, also known as the activity series, ranks elements based on their standard electrode potentials.
Correct answer: Decrease from top to bottom- A. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s
- B. 1s, 2s, 2p, 3s, 3p, 3d, 4p, 4s, 5s
- C. 1s, 2s, 2p, 3s, 3p, 3d, 3f, 4s, 5d
- D. 1s, 2s, 2p, 3s, 3p, 4s, 4p, 4d, 5s
Explanation: The order of atomic orbitals is determined by their energy levels. This order follows the Aufbau principle and the (n+l) rule.
Correct answer: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s- A. 105.8 x 10⁻² Å
- B. 1.061 Å
- C. 0.55 Å
- D. 131.3 x 10⁻² Å
Explanation: The diameter of a hydrogen atom is indeed approximately 105.8 x 10⁻² Å.
Correct answer: 105.8 x 10⁻² Å- A. Lyman series
- B. Paschen series
- C. Brackett series
- D. Pfund series
Explanation: You are right, the Paschen series is the correct answer. The Paschen series corresponds to electron transitions from higher energy levels…
Correct answer: Paschen series- A. Zero
- B. Less than zero. Here's why
- C. Greater than zero
- D. None of these
Explanation: Potential Energy: The potential energy of an electron in an atom is negative.
Correct answer: Less than zero. Here's why- A. Minimum
- B. Maximum
- C. Intermediate
- D. None of these
Explanation: Electrostatic Attraction: Electrons in the outermost shell are furthest from the nucleus.
Correct answer: Minimum- A. Lyman Series
- B. Balmer Series
- C. Spectral Series
- D. Paschen and Pfund Series
Explanation: Balmer Series: The Balmer series corresponds to transitions where the electron falls to the second energy level (n=2).
Correct answer: Balmer Series- A. Lyman series
- B. Balmer series
- C. Paschen series
- D. Pfund series
Explanation: UV Light: Ultraviolet (UV) light has a higher energy than visible light.Electron Transitions: The Lyman series corresponds to transitions…
Correct answer: Lyman series- A. Hybrid Orbitals
- B. Degenerate Orbitals
- C. None of these
- D. Both a and b
Explanation: Degenerate Orbitals: Degenerate orbitals are orbitals within the same subshell (e.g., 2p orbitals) that have the same energy level.
Correct answer: Degenerate Orbitals- A. Maximum discharge
- B. Minimum discharge
- C. No discharge
- D. Moderate discharge
Explanation: Discharge Tubes: Discharge tubes are used to study the behavior of gases under low pressure.
Correct answer: No discharge- A. l = 1, m = +1, 0, -1
- B. l = 0, m = +1, 0, -1
- C. l = 2, m = +1, 0, -1
- D. l = 3, m = +1, 0, -1, +2, -2
Explanation: The correct answer is (a) l = 1, m = +1, 0, -1. Here's why:Quantum Numbers: Quantum numbers describe the properties of electrons in…
Correct answer: l = 1, m = +1, 0, -1- A. Magnetic Quantum Number (m)
- B. Principal Quantum Number (n)
- C. Azimuthal Quantum Number (l)
- D. All of these
Explanation: The principal quantum number (n) determines the energy level of an electron. Higher values of n indicate higher energy levels.
Correct answer: Principal Quantum Number (n)338. d subshell has
- A. 3 orbitals
- B. 5 orbitals
- C. 7 orbitals
- D. 12 orbitals
Explanation: d Subshell: The d subshell corresponds to the azimuthal quantum number (l) = 2.Magnetic Quantum Number (m): For l=2, the magnetic quantum…
Correct answer: 5 orbitals- A. C
- B. O
- C. P
- D. S
Explanation: Nuclear Reaction: This reaction is a classic example of nuclear transmutation.
Correct answer: C- A. Lyman
- B. Balmer
- C. Pfund
- D. None of these
Explanation: Lyman Series: The Lyman series in the hydrogen atom corresponds to electron transitions where the electron falls to the ground state…
Correct answer: Lyman