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Q.

Correct statements regarding F-centres are
a) they impart magnetic propertes to the crystal
b) they impart colour to crystals
c) they increases the conductivity of crystals The correct answers are

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a

only b and c

b

only b

c

only c

d

a, b and c

answer is D.

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Detailed Solution

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  • F− center is a type of crystallographic defect in which an anionic vacancy in a crystal is filled by one or more unpaired electron, depending on the charge of the missing ion in the crystal.
  • These unpaired electrons produce color in the crystal by absorbing light in the visible spectrum and also impart magnetic properties.
  • The unpaired electron acts as charge carriers and hence the crystal conducts electricity.
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