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Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

Question: The colour of NaCl changes when heated in sodium vapour due to


A

Excess of sodium in the crystal

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B

Electrons in the voids

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C

Excess of chlorine in the crystal

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D

Deficiency of sodium in the crystal

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Solution

The correct option is B

Electrons in the voids


As anions are missing from the lattice points, e occupy these voids. There e impart colour to the crystal. So there voids are called F-centers(Farbe means color in german) and colour centers.


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