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 38 of 47
741. According to Bohr theory only those orbit are allowed along which angular momentum of electron is:
- A. 2π/nh
- B. nh/2π
- C. n/2πh
- D. 2πn/h
Explanation: In Bohr's theory, only certain electron orbits are allowed where the angular momentum of the electron is quantized, meaning it can only…
Correct answer: nh/2π- A. Rydberg
- B. Bohr
- C. Balmer
- D. Paschen
Explanation: The scientist who delved into the spectrum of hydrogen in the visible light wavelength range was actually (c) Balmer.
Correct answer: Balmer- A. Balmer series
- B. Lyman series
- C. Paschen series
- D. Brackett series
Explanation: (a) Balmer series: The Balmer series is the first series identified in the spectrum of hydrogen.
Correct answer: Balmer series- A. 1685
- B. 1785
- C. 1985
- D. 1885
Explanation: The Balmer series was actually identified in 1885. It was a significant milestone in understanding the spectrum of hydrogen, shedding…
Correct answer: 1885- A. Visible region
- B. Invisible region
- C. Ultraviolet region
- D. Infra-red region
Explanation: The Balmer series finds its home in the visible region of the electromagnetic wave spectrum.
Correct answer: Visible region- A. Newton
- B. Bohr
- C. Rydberg
- D. Planck
Explanation: In 1896, the results of spectra obtained by Balmer were expressed by Johannes Rydberg.
Correct answer: Rydberg- A. 1.0974 x 10^7m-1
- B. 1.0974 x 10^-7m-1
- C. 1.0974 x 10^6m-1
- D. 1.0974 x 10^-6m-1
Explanation: The Rydberg constant is like the VIP pass to the atomic world. It's around 1.097 x 10^7 per meter, and it's super important in figuring…
Correct answer: 1.0974 x 10^7m-1748. During the transition of electron of hydrogen atom from higher orbit to a third orbit, a photon of:
- A. Paschen series is emitted
- B. Balmer series is emitted
- C. Lyman series is emitted
- D. Brackett series is emitted
Explanation: The transition of an electron from a higher orbit to the third orbit in a hydrogen atom corresponds to the Paschen series.
Correct answer: Paschen series is emitted- A. Sodium vapour
- B. Atomic hydrogen
- C. Molten iron
- D. Mercury vapour lamp
Explanation: Absorption spectrum is a type of spectrum in which electron absorbs energy from a source to go from lower energy level to higher energy…
Correct answer: Atomic hydrogen- A. Continuous spectrum
- B. Band spectrum
- C. Line spectrum
- D. None of these
Explanation: When the radiations emitted from a hydrogen-filled discharge tube are passed through a prism or a diffraction grating, they produce a…
Correct answer: Line spectrum- A. rh / 2π
- B. nh / 2π
- C. 2πn / h
- D. 2πr / h
Explanation: nh / 2π is the answer to this, just a factual recall. This is the correct expression representing Bohr's quantisation of angular momentum…
Correct answer: nh / 2π- A. UV
- B. IR
- C. Visible
- D. Microwaves
Explanation: Balmar series are then only lines that lie in visible region.
Correct answer: Visible- A. Lyman
- B. Balmer
- C. Visible
- D. Infrared
Explanation: Correct option is B. The Balmer series is the name given to a series of spectral emission lines of the hydrogen atom that result from…
Correct answer: Balmer- A. hc/(E1 - E2)
- B. h/(E1 - E2)
- C. h/c(E1 - E2)
- D. (E1 - E2)/hc
Explanation: But as per ptb, the energy change is given by ∆E=E2-E1∆E=hv∆E=hc/λ E2- E1=hc/λ λ =hc/E2- E1 Ans
Correct answer: hc/(E1 - E2)- A. n3 → n2
- B. n4 → n3
- C. n5 → n4
- D. n6 → n5
Explanation: The transition of an electron from n3 to n2 in the hydrogen atom emits the maximum energy because the energy levels are closer together…
Correct answer: n3 → n2- A. A
- B. B
- C. C
- D. D
Explanation: The correct answer is A. The ultraviolet (UV) region is a part of the electromagnetic spectrum that is positioned between the visible…
Correct answer: A- A. 1s
- B. 2p
- C. 3s
- D. 3d
Explanation: In atomic physics, photon emission occurs when an electron transitions from a higher energy level to a lower one.
Correct answer: 1s- A. spherical
- B. dumb-bell shaped
- C. double dumb-bell shaped
- D. irregular
Explanation: A p orbital has two lobes on either side of the nucleus with a node at the nucleus itself, giving the familiar dumb-bell shape.
Correct answer: dumb-bell shaped- A. By burning of gas
- B. By the bombardment of cathode rays on gas molecules
- C. By cooling of the gas
- D. From the anode like cathode rays, produced from cathode
Explanation: Positive rays, also known as canal rays or anode rays, are produced by the bombardment of cathode rays on gas molecules.
Correct answer: By the bombardment of cathode rays on gas molecules- A. de-Broglie dual nature of matter
- B. Bohr's model
- C. Planck's Quantum theory
- D. Rutherford's atomic model
Explanation: The relationship between the energy (E) of a photon of light and its frequency (ν) is given by Planck's Quantum theory and is expressed by…
Correct answer: Planck's Quantum theory