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why is common salt sometime yellow instead of being pure salt?

it is due 2 some impurities or when they rectact  with something else

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Because of sunlight

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due to presence of f centeres or anion vaccancy defect in their crystals

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We know salt is Sodium Chloride NaCl. When the Na atoms in the compound react with the sodium vapors in the atmosphere, the sodium atoms are deposited on the surface of the crystal. The Na atoms lose electrons to become Na ions. This creates an excess of sodium content in the crystal. The released electrons occupy anionic sites (F-centres). These absorb energy and give out light of the corresponding frequency (visible range). That's how yellow color is imparted to the common salt crystals. 
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It may not turn yellow.  purified salt can contain impurities like sand, mud, and other metal salts, which can impart color to the salt. The salt doesn't change colour on storage.
though it can change color due to metal excess defect too this is also r8
 
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It is because of the addition of electron in vacant space due to which it goes to higher energy level and come back in lower level to loses energy and show complementary colours in visible region . It is occur in common salt due to metal excess defect in anion vacancy.
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It won't turn yellow. A partially purified salt can contain impurities like sand, mud, and other metal salts, which can impart colour to the salt. The salt doesn't change colour on storage.
 
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Sunlight
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Due to anionic metal excess defect due to anionic valencies....due to which f centre is present ...and electron's excitement of f centre is responsible for colour..refer ncert
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It may be due to impurities or due to the addition of electron in the vacant space.
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soumya is right
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because of metal excess defect by anion vacancy

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it is due to defect in their crystals
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Because presence of some electrons in some lattice, site in place of anions these sites acts as f-centres( farbe centre or colour centre) these electrons when exites impart colours.[ in f-centre crystal are filled by one or more unpaired electrons ].
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This is 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. That's why sometimes they show a yellow colour. 
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It is due to the metal access defect due to anionic vacancy and due to F centered electron. When NaCl is heated with Na vapour it show yellowish colour
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?????
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It may be due to impurities or due to the addition of electron in the vacant space.
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Tvkhdcbj
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due to presence of f centers the common salt appears to be yellow
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Duo to
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We went options
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Don't know
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hello
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Common salt is yellow sometimes due to the presence of electrons in some lattice sites in place of anions these sites act as F‐centers. These electrons when excited impart color to the crystal.
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Product of charge and distance b/w them
P=q?2ak
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