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

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photosensitivity of sodium

low ionization potential of sodium

sublimation of metallic sodium to give yellow vapour.

emission of excess of energy absorbed by the electron as a radiation in the visible region, during de-exitation

answer is D.

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Detailed Solution

When an alkali or alkaline earth metal (or its salt) is introduced in the flame, the valence electrons of the metal absorbs energy and are excited to the higher energy level.

When excited electrons return to their ground state, they release the absorbed energy as visible light.

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