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Match List-I with List-II. List-I Alkali Metal (A) Li (B) Na (C) Rb (D) Cs List-II Emission Wavelength in nm (I) 589.2 (II) 455.5 (III) 670.8 (IV) 780.0 Choose the correct answer from the options given below:

1. (A)-(I), (B)-(IV), (C)-(III), (D)-(II)
2. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
3. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
4. (A)-(II), (B)-(I), (C)-(III), (D)-(IV)

Correct answer: (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Solution

The correct option matches each alkali metal with its characteristic emission wavelength, which is based on their atomic structure and energy transitions. Lithium emits light at 670.8 nm, sodium at 589.2 nm, rubidium at 780.0 nm, and cesium at 455.5 nm, aligning perfectly with the provided pairs.

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