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.
Last updated
59 questions · page 1 of 3
- A. n = 1
- B. n = 2
- C. n = 3
- D. n = 4
Explanation: The Balmer series arises from transitions ending at n equal to 2 and it is the only hydrogen series that falls in the visible region…
Correct answer: n = 2- A. electrons can have any energy value
- B. electron energies inside an atom are quantised
- C. the nucleus contains neutrons
- D. hydrogen atoms contain more than one electron
Explanation: A hot gas emits light only at particular wavelengths, producing separate bright lines instead of a continuous band, and each line…
Correct answer: electron energies inside an atom are quantised- A. electrons can occupy any orbit
- B. electrons occupy fixed energy levels and emit a photon when moving to a lower one
- C. the nucleus emits light directly
- D. electrons spiral into the nucleus
Explanation: Restricting electrons to discrete levels means only certain energy differences are available, so only certain frequencies appear, which is…
Correct answer: electrons occupy fixed energy levels and emit a photon when moving to a lower one- A. n equals 1
- B. n equals 2
- C. n equals 3
- D. n equals 4
Explanation: Transitions to the second level release energies corresponding to visible light, which is why the Balmer lines are the ones seen through a…
Correct answer: n equals 2- A. 10.54ev
- B. 12.54ev
- C. 13.6ev
- D. 17.56ev
Explanation: Removing the electron from ground-state hydrogen requires 13.6 eV per atom because hydrogen's ground-state energy is -13.6 eV and…
Correct answer: 13.6ev- A. Alpha radiations
- B. Gamma radiations
- C. Beta radiations
- D. positron
Explanation: Beta radiation consists mainly of high-speed electrons, so it carries a negative charge.
Correct answer: Beta radiations- A. Alpha radiations
- B. Gamma radiations
- C. Beta radiations
- D. AOT
Explanation: Gamma radiation travels at the speed of light in vacuum, about 3.0 x 10^8 m/s, whereas alpha and beta particles travel below this speed…
Correct answer: Gamma radiations- A. visible radiation
- B. Ultra violet radiation
- C. Infrared radiation
- D. Gamma rays
Explanation: Ultraviolet radiation supplies the energy needed to split oxygen molecules into oxygen atoms, which then combine with O2 to form ozone…
Correct answer: Ultra violet radiation- A. 1000 to 300 A°
- B. 3800 to 7600 A°
- C. 8000 to 10,000 A°
- D. 12,000 to 15,000 A°
Explanation: Visible light has wavelengths of approximately 3800 to 7600 Å, equivalent to 380 to 760 nm.
Correct answer: 3800 to 7600 A°- A. Orbit is cylindrical
- B. Orbit is elliptical
- C. Orbit is longitudinal
- D. Orbit is asymmetrical
Explanation: Sommerfeld extended Bohr’s circular-orbit model by allowing electrons to move in elliptical as well as circular orbits, helping explain…
Correct answer: Orbit is elliptical- A. when electrons jump down to 2nd- orbit
- B. when electrons jump down to 3rd- orbit
- C. when electrons jump down to 4th- orbit
- D. when electrons jump down to 5th- orbit
Explanation: The Pfund series consists of hydrogen-electron transitions that end at the fifth energy level, n = 5, with photons emitted in the infrared…
Correct answer: when electrons jump down to 5th- orbit- A. Zeeman effect
- B. Stark effect
- C. Photoelectric effect
- D. Compton effect
Explanation: The Stark effect is the splitting or shifting of spectral lines when atoms are placed in a strong electric field.
Correct answer: Stark effect- A. Lyman
- B. Paschen
- C. Pfund
- D. Brackett
Explanation: When an electron falls to the first orbit, n = 1, the emitted spectral lines belong to the Lyman series.
Correct answer: Lyman- A. Different wavelength
- B. Different colours
- C. Different intensities
- D. all have little contribution
Explanation: A spectrum is produced when radiation is separated according to wavelength, producing distinct wavelengths or corresponding frequencies.
Correct answer: Different wavelength- A. Zeemans effect
- B. Starks effect
- C. Photo electric effect
- D. Compton effect
Explanation: The splitting of spectral lines in the presence of a magnetic field is called the Zeeman effect.
Correct answer: Zeemans effect- A. Brighter
- B. Darker
- C. Colourless
- D. Hard to locate
Explanation: When atoms absorb selected frequencies of energy, electrons move to higher energy levels and remove those wavelengths from transmitted…
Correct answer: Darker- A. 0.56nm
- B. 0.053nm
- C. 0.09nm
- D. 0.098nm
Explanation: The probability of finding an electron in a hydrogen atom is not precisely at 0.56nm because the the specific shape of the probability…
Correct answer: 0.053nm- A. Lyman series
- B. Balmer series
- C. Paschen series
- D. Brackett series
- E. Pfund series
Explanation: Four of the Balmer lines are in the technically "visible" part of the spectrum, with wavelengths longer than 400 nm and shorter than 700…
Correct answer: Balmer series19. On the hydrogen atom spectrum, a series of spectral lines that fall within the visible region is:
- A. Lymen series
- B. Balmer Series
- C. Paschen series
- D. Bracket series
- E. Pfund series
Explanation: Lyman series of hydrogen atom lies in ultraviolet region, Balmer series lies in visible region while Pfund and Paschen series lie in…
Correct answer: Balmer Series- A. 2 𝜋 x
- B. 6 𝜋 x
- C. 9 x
- D. x / 3
Explanation: The radius of the first Bohr orbit is x, then the de-Broglie wavelength of electrons in the 3rd orbit is near:λ=3×2πx=6 πx (n=3)
Correct answer: 6 𝜋 xSpectrum of Hydrogen MCQs: common questions
Are these Spectrum of Hydrogen MCQs free?
Yes. All Spectrum of Hydrogen MCQs from Chemistry are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.
How many Spectrum of Hydrogen MCQs are on this page?
There are 59 Spectrum of Hydrogen MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Spectrum of Hydrogen MCQ have an explanation?
Yes. Each Spectrum of Hydrogen question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Spectrum of Hydrogen test?
Yes. The practice button on this page starts a free Spectrum of Hydrogen test drawn from the Chemistry bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.