NEET Chemistry: Spectrum of the hydrogen atom Practice Questions
15 free multiple-choice questions on Spectrum of the hydrogen atom (Atomic Structure) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. When an electron in a hydrogen atom transitions from a higher energy level to a lower energy level, the emitted radiation is characteristic of which type of spectral emission?
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Correct answer: A — Emission
When an electron falls from a higher energy state to a lower energy state, it releases energy in the form of a photon, which is defined as emission.
Q2. The spectral lines observed in the hydrogen atom are characteristic of transitions between discrete energy levels. This observation is a direct consequence of which fundamental principle in atomic structure?
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Correct answer: B — Quantization of Energy
The discrete nature of the spectral lines arises because the energy of the electron is quantized, meaning it can only exist in specific, discrete energy levels (Eₙ), as dictated by the quantization of energy.
Q3. The spectral series that produces the visible light observed in the hydrogen spectrum corresponds to which transition type?
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Correct answer: B — Transitions from n=1
The visible light series is the Balmer series, which involves transitions where the final energy level is n=2.
Q4. Which transition in the hydrogen atom results in the emission of radiation corresponding to the longest wavelength observed in the visible spectrum?
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Correct answer: D — Balmer series transition
The Balmer series transitions (n_f = 2) correspond to the transition that results in photons with wavelengths falling within the visible region of the electromagnetic spectrum.
Q5. Which spectral series in the hydrogen atom corresponds to the transition where the electron moves to the lowest energy level (ground state)?
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Correct answer: A — Balmer series
The Balmer series corresponds to transitions where the electron moves to the second energy level (n_f=2), which is the transition to the lowest energy state (ground state) within the observable series.
Q6. Which spectral series is responsible for the absorption of radiation in the ultraviolet region?
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Correct answer: C — Lyman series
The Lyman series corresponds to transitions where the final state is n=1. These transitions require the largest energy input, typically in the ultraviolet region.
Q7. The transition of an electron from the first energy level (n=1) to any other level results in emission of radiation belonging to which series?
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Correct answer: B — Lyman series
Transitions starting from the ground state (n=1) always belong to the Lyman series. This series involves transitions to n=1 from higher states.
Q8. The energy difference between two specific energy levels in the hydrogen atom is used to determine the frequency of the emitted photon. This energy difference is calculated using which fundamental equation?
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Correct answer: C — Bohr's formula for spectral lines (E₂ - E₁ = hν)
The energy difference (ΔE) between two states in the Bohr model is directly related to the energy of the emitted photon (ΔE = E₂ - E₁ = hν).
Q9. In the context of the hydrogen atom, what physical phenomenon causes the emission of radiation from the atom?
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Correct answer: B — Excitation of an electron to a higher orbit
Radiation (light) is emitted when an electron transitions from a higher energy state to a lower energy state (de-excitation).
Q10. The transition of an electron from a higher energy level to a lower energy level in a hydrogen atom results in the emission of energy in the form of:
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Correct answer: B — Light (photons)
When an electron drops from a higher energy level to a lower energy level, the excess energy is released in the form of electromagnetic radiation, which is light (photons).
Q11. Which spectral series corresponds to transitions resulting in the highest energy radiation (shortest wavelength) in the hydrogen spectrum?
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Correct answer: C — Lyman series
The Lyman series corresponds to transitions ending at the n=1 level, which involves the largest energy difference and thus emits the highest energy radiation (shortest wavelength).
Q12. Which series of spectral lines in the hydrogen atom corresponds to transitions where the electron ends up in the n=2 energy level?
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Correct answer: C — Balmer series
The Balmer series corresponds to transitions where the final energy level is n_f=2 (i.e., nᵢ > 2 → n_f=2).
Q13. If an electron in a hydrogen atom moves from a higher energy level to a lower energy level, what happens to the energy of the emitted photon?
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Correct answer: A — The energy of the emitted photon increases
When an electron falls to a lower energy state, the excess energy is released in the form of a photon, meaning the emitted energy is positive.
Q14. The energy levels in the hydrogen atom are quantized. What does this quantization imply about the electron's allowed orbits?
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Correct answer: B — The electron orbits are defined by specific, discrete energy values
Quantization means that the electron can only exist in discrete, specific, and well-defined energy levels (stationary states).
Q15. Which series of spectral lines corresponds to the electron transitions where the final energy level is n=2 (Balmer series)?
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Correct answer: C — Balmer series
The Balmer series corresponds to transitions where the final energy level (n_f) is 2. This series is observable in the visible light region for transitions in hydrogen.
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