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 3 of 3
- 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. Lyman
- B. Paschen
- C. Brackett
- D. Pfund
- E. Balmer
Explanation: The explanation for this question will be added soon.
Correct answer: Balmer- A. Shells
- B. Energy levels
- C. Sub shells
- D. All of these options are correct
Explanation: A. Shells (Incorrect): Fine lines in a line spectrum are indicative of transitions between energy levels within an atom, not the presence…
Correct answer: Sub shells- A. 10-8 m
- B. 10-1 m
- C. 10-11 m
- D. 10-13 m
Explanation: The radius of an electron orbit in a hydrogen atom, as estimated by the Bohr model, is approximately 0.529 angstroms.
Correct answer: 10-11 m- A. Shells
- B. Energy Levels
- C. Subshells
- D. All of these
Explanation: Option A is incorrect because electrons can't jump between "shells". Option B is incorrect because the line spectrum is caused by the…
Correct answer: Subshells- A. Balmer
- B. Pfund
- C. Paschen
- D. none of these
Explanation: When the electron series terminates at 4th orbit, the 'Bracket series' is obtained.
Correct answer: none of these- A. Balmer
- B. Pfund
- C. Paschen
- D. None of these options are correct
Explanation: None of these options are correct. When an electron series terminates on the 4th orbit, it corresponds to the Lyman series.
Correct answer: None of these options are correct- A. Shells
- B. Energy levels
- C. Sub shells
- D. All of these
Explanation: Presence of subshells is shown by several fine lines on the line spectrum.
Correct answer: Sub shells- A. Negative (-Ve)
- B. Positive (+Ve)
- C. Zero
- D. None
Explanation: In the hydrogen atom, the force we are primarily referring to is the attractive force acting between the nucleus and the electron and this…
Correct answer: Negative (-Ve)- A. 4.9 volt
- B. 8.5 * 10-10 volt
- C. 3.4 volt
- D. 13.6 volt
Explanation: The ionization energy of a hydrogen atom is the energy required to remove an electron from the atom.
Correct answer: 13.6 volt- A. Zero
- B. Negative
- C. Positive
- D. None of the above
Explanation: The energy of a hydrogen atom in its ground state is negative, approximately -13.6 eV.
Correct answer: Negative- A. -13.6eV
- B. -3.4eV
- C. -0.85eV
- D. -1.5eV
Explanation: The energy of an electron in the excited state with n=4 in a hydrogen atom can be calculated by using the formula for the energy levels of…
Correct answer: -0.85eV55. If an atom exists in the excited state n = 5, the maximum number of transitions that take place are:
- A. 6
- B. 5
- C. 10
- D. 3
Explanation: To solve such a question, here's an amazing trick! We know that n is 5. Step 1: From the 'n' value, start counting backwards. i.e.
Correct answer: 10- A. 2 times
- B. 3 times
- C. 4 times
- D. 5 times
Explanation: Since r = n^2 (0.053nm) When n = 1 r1 = 0.053nm When n = 2 r2 = 2^2 (r1) r2 = 4 r1 An increase in the radius of orbit when an electron…
Correct answer: 3 times- A. 13.6 eV
- B. 1.36 eV
- C. 10.2 eV
- D. 4.3 eV
Explanation: The ionization potential of a hydrogen atom is 13.6 eV, which is the energy needed to completely remove the electron from the nucleus when…
Correct answer: 13.6 eV- A. Increases with increasing energy
- B. Decreases with increasing energy
- C. First increases and then decreases with increasing energy
- D. First decreases and then increases with increasing energy
Explanation: As energy levels increase, the energy difference between adjacent ones decreases due to the trend of decreasing energy from the energy…
Correct answer: Decreases with increasing energy- A. 1.51 eV
- B. 3.4 eV
- C. 13.6 eV
- D. 12.1 eV
Explanation: The energy required to ionize a hydrogen atom from a given state is the difference between the energy of that state and the energy of the…
Correct answer: 1.51 eV