Free Spectrum of Hydrogen MCQs with Answers
59 Spectrum of Hydrogen MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The hydrogen spectrum consists of discrete emission lines produced when electrons fall between quantised energy levels and release photons. Questions use the Rydberg equation, photon energy and wavelength, and identify the Lyman, Balmer, Paschen, Brackett and Pfund series, which differ from continuous spectra.
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59 questions · page 2 of 3
- A. 11097 A
- B. 18750 A
- C. 17884 A
- D. 19001 A
Explanation: Option B is correct according to the calculations.
Correct answer: 18750 A- A. 1.0974 nm
- B. 4 nm
- C. 364.6 nm
- D. 3.64 m
- E. 480 nm
Explanation: Attached below is the solution to the question above:
Correct answer: 364.6 nm- A. De-Broglie
- B. Einstein
- C. Newton
- D. Rutherford
Explanation: Louis de Broglie's wave-particle duality theory was indeed influential in understanding the behavior of particles, including electrons.
Correct answer: De-Broglie- A. λ = hv
- B. λ = hp
- C. λ = h/2λ
- D. λ = h/p
Explanation: De-Broglie's wavelength equation, λ = h/p, relates the wavelength (λ) of a particle to its momentum (p) and Planck's constant (h).
Correct answer: λ = h/p- A. 1886
- B. 1887
- C. 1895
- D. 1885
Explanation: The study of hydrogen visible spectrum occurred in 1885. During this period, scientists were actively investigating the properties of…
Correct answer: 1885- A. 1913
- B. 1919
- C. 1918
- D. 1905
Explanation: In 1913, Niels Bohr introduced his atomic model for hydrogen. He suggested that electrons move in fixed orbits around the nucleus, which…
Correct answer: 191327. 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-134. 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)