JEE Main Chemistry question

Sodium chloride imparts a golden yellow colour to the Bunsen flame. This can be interpreted due to:

(A)Low ionization potential of sodium
(B)Photosensitivity of sodium
(C)Sublimation of metallic sodium to give yellow vapour
(D)Emission of excess of energy absorbed as a radiation in the visible regionCorrect

Answer: (D)

Solution

In the flame test, thermal energy excites a valence electron of sodium to a higher energy level; as the electron falls back to the ground state, the absorbed energy is re-emitted as electromagnetic radiation, which for sodium falls in the visible yellow region, producing the characteristic flame colour. Low ionisation

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Question ID VK-137876