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Q.

In the laboratory, sodium chloride is made by burning the sodium chloride  in the presence of sodium is yellow in colour, The cause of yellow colour is

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a

Presence of Na+ ions in the crystal lattice

b

Presence of Cl- ions in the crystal lattice

c

Presence of electrons  in the anionic vacancies of the crystal lattice

d

Presence of face centered cubic crystal lattice

answer is C.

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Detailed Solution

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

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