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MCQEasyJEE 2024Bohr Model & Hydrogen Spectrum

JEE Chemistry 2024 Question with Solution

Match List I with List II: List I (Spectral Series for Hydrogen) | List II (Spectral Region) A. Lyman | I. Infrared region B. Balmer | II. UV region C. Paschen | III. Infrared region D. Pfund | IV. Visible region

  • A

    A-II, B-III, C-I, D-IV

  • B

    A-I, B-III, C-II, D-IV

  • C

    A-II, B-IV, C-III, D-I

  • D

    A-I, B-II, C-III, D-IV

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: Match the hydrogen spectral series with their spectral regions.

Find: The correct matching between List I and List II.

For hydrogen spectral series:

Lyman series→n=1→UV regionBalmer series→n=2→Visible regionPaschen series→n=3→Infrared regionPfund series→n=5→Infrared region\begin{aligned} &\text{Lyman series} &&\to n = 1 &&\to \text{UV region} \\ &\text{Balmer series} &&\to n = 2 &&\to \text{Visible region} \\ &\text{Paschen series} &&\to n = 3 &&\to \text{Infrared region} \\ &\text{Pfund series} &&\to n = 5 &&\to \text{Infrared region} \end{aligned}

So the matching is:

A−II,  B−IV,  C−III,  D−IA-\text{II},\; B-\text{IV},\; C-\text{III},\; D-\text{I}

Therefore, the correct option is C.

Recall-Based Mapping

Given: The standard hydrogen emission series.

Find: Which option contains the correct region mapping.

Recall the sequence of commonly used hydrogen series regions:

  • Lyman →\to UV
  • Balmer →\to Visible
  • Paschen →\to Infrared
  • Pfund →\to Infrared

Comparing this directly with the options gives:

A−II,  B−IV,  C−III,  D−IA-\text{II},\; B-\text{IV},\; C-\text{III},\; D-\text{I}

Hence, the correct option is C.

Common mistakes

  • Confusing Lyman and Balmer series. Lyman ends at n=1n=1 and lies in the UV region, whereas Balmer ends at n=2n=2 and lies in the visible region. Always recall the final energy level first, then the spectral region.

  • Assuming every higher series is visible. Only the Balmer series is in the visible region for hydrogen. Paschen and Pfund both lie in the infrared region, so do not force a one-to-one visible assignment.

  • Matching by option pattern instead of concept. Similar-looking combinations can be misleading. First write the known mappings of each series, then compare with the options.

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