Question

Match List-I with List-II.

List-I (Metal)	List-II (Emitted light   wavelength (nm))
(A) Li	(I) 670.8
(B) Na	(II) 589.2
(C) Rb	(III) 780.0
(D) Cs	(IV) 455.5

Choose the most appropriate answer from the options given below:

• A. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• B. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• C. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
• D. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Answer 1

The Correct Option is A

The question requires us to match metals in List-I with their corresponding emitted light wavelengths from List-II. This involves understanding the characteristic wavelengths emitted by these metals when they are heated. Let's analyze each metal:

1. Lithium (Li): Lithium emits light at a wavelength of 670.8 nm. This is its characteristic red light.
2. Sodium (Na): Sodium is well-known for emitting light in the yellow region at a wavelength of 589.2 nm. This is the famous sodium D-line used in street lighting.
3. Rubidium (Rb): Rubidium emits light in the near-infrared region at a wavelength of 780.0 nm.
4. Cesium (Cs): Cesium emits light in the blue region at a wavelength of 455.5 nm.

Based on this information, we can now match the metals from List-I to their corresponding wavelengths in List-II:

1. (A) Li - (I) 670.8 nm: Lithium emits at this specific wavelength.
2. (B) Na - (II) 589.2 nm: Sodium emits at this specific wavelength.
3. (C) Rb - (III) 780.0 nm: Rubidium emits at this specific wavelength.
4. (D) Cs - (IV) 455.5 nm: Cesium emits at this specific wavelength.

Thus, the correct match is (A)-(I), (B)-(II), (C)-(III), (D)-(IV). This confirms the given correct answer is accurate. This information is useful in spectroscopy and helps identify elements based on their spectral lines.