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Why common salt is sometimes yellow instead of being pure white ?

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asked Dec 9, 2017 in Chemistry by sforrest072 (157,439 points) ● 60 ● 409 ● 937
edited Dec 9, 2017 by sforrest072

Why common salt is sometimes yellow instead of being pure white ?

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+1 vote
answered Dec 9, 2017 by mdsamim (213,225 points) ● 5 ● 10 ● 15
selected Dec 9, 2017 by sforrest072
 
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Due to the presence of electrons in some lattice sites in place of anions these sites act as F-centres. These electrons when excited impart colour to the crystal.

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