JEE Main Chemistry question

The metallic lustre exhibited by sodium is due to:

(A)Diffusion of ions
(B)Oscillation of loose electronsCorrect
(C)Excitation of free protons
(D)Existence of body centred cubic lattice

Answer: (B)

Solution

As with all metals, sodium's characteristic lustre arises from the free, delocalised valence electrons in the metallic lattice oscillating in response to incident light and re-emitting it. This is not due to ion diffusion (A), "excitation of

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Question ID VK-137771