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

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

The Solid State

Solution:

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