Question

In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is.

• A. Presence of $Na^{+}$ions in the crystal lattice
• B. Presence of $Cl^{-}$ions in the crystal lattice
• C. Presence of electron in the crystal lattice
• D. Presence of face centered cubic crystal lattice

Answer 1

Answer: (C)

Presence of electron in the crystal lattice

Answer 2

Yellow colour on heating $NaCl$ in presence of $Na$ is due to presence of electrons in anion vacancies (F-centres).