Question

NaCl crystals have some yellow colour. This is due to the presence of ______​

Answer 1

Answer:

$<b><marquee>$ presence of excess sodium makes Nacl crystal coloured.

Answer 2

Answer:

This yellow colour is due to metal excess defect of anionic valency. Na+ion deposited on the surface of crystal of NaCl . ... This happens by loss of electron from Na to Na+. The released electro diffused into the crystal and occupy anionic site called F center which imparts yellow colour to NaCl.