JEE Main 2024 — S Block Elements Question with Solution
From: JEE Main 2024 (Online) 6th April Evening Shift
Question
Match List I with List II.
| LIST I Alkali Metal |
LIST II Emission Wavelength in nm |
||
|---|---|---|---|
| A. | Li | I. | 589.2 |
| B. | Na | II. | 455.5 |
| C. | Rb | III. | 670.8 |
| D. | Cs | IV. | 780.0 |
Choose the correct answer from the options given below :
Choose an option
Show full solutionCorrect option: B
Step-by-step explanation
To match List I (Alkali Metals) with List II (Emission Wavelength in nm), we need to know the characteristic emission lines of these elements. Here is the information for the typical emission wavelengths:
- Lithium (Li): 670.8 nm
- Sodium (Na): 589.2 nm
- Rubidium (Rb): 780.0 nm
- Cesium (Cs): 455.5 nm
Now let's match these with the given options:
- A. Li (III): 670.8 nm
- B. Na (I): 589.2 nm
- C. Rb (IV): 780.0 nm
- D. Cs (II): 455.5 nm
Therefore, the correct answer is:
Option B
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
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This is a previous-year question from JEE Main 2024, covering the S Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.