Question

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

• A. low ionisation of energy of sodium
• B. sublimation of metalic sodium to give yellow vapour
• C. emission of excess energy absorbed as a radiation in the visible region
• D. photo sensitivity of sodium

Answer 1

Answer: (C)

emission of excess energy absorbed as a radiation in the visible region

Sodium chloride imparts a yellow color to the Bunsen flame. This can be interpreted due to the emission of excess energy absorbed as a radiation in the visible region.

When an alkali or akaline 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.