| In the following figure the blank X in known as __________ and why? |
 |
A) Electron trap, because an electron is present
B) Metal deficient centre, since negative charge is present here.
C) F-centre, since it imparts colour to the crystal.
D) P-centre, since it is responsible for positive charge on the crystal.
Correct Answer: C
Solution :
The anionic sites occupied by the unpaired electrons are called F-centres from the German word Farbenzenter for colour centre.
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