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Why common salt (NaCl) sometimes appear ...

Why common salt `(NaCl)` sometimes appear yellow?

Text Solution

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Yellow colour of sodium chloride is due to metal excess defect as a result which unpaired electrons occupy anionic sites. These sites are known as F-centres. The electrons absorb energy from the visible region of light for their excitation. These electrons emit radiations corresponding to yellow colour and impart the same to the crystals of sodium chloride.
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Knowledge Check

  • Crude common salt becomes damp on keeping in air because :

    A
    It is hygroscopic in nature.
    B
    It contains `MgCI_2` and `CaCl_2` as impurities which are deliquescent in nature.
    C
    (1) and (2) both.
    D
    none

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