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Crystalline and Amorphous Solid

Presence of e...

Question

Presence of excess Sodium makes $N a C l$ crystal coloured. Explain on the basis of crystal defects :

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Solution

Presence of excess $s o d i u m$ makes NaCl crystal yellow coloured. $C h l o r i d e$ ion is is absent from its lattice site, leaving a hole which is occupied by an electron to maintain electrical neutrality. The holes occupied by electrons are called F-centres and are responsible for the colour of the compound.

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