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(D) The color of metal ions in a flame is due to the presence of $F$-centers. These $F$-centers are formed due to metal excess defect,where anionic si

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Metal excess defect

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(D) The color of metal ions in a flame is due to the presence of $F$-centers. These $F$-centers are formed due to metal excess defect,where anionic sites are occupied by unpaired electrons. When these electrons absorb energy from the visible light,they get excited and emit radiation in the visible region,which imparts color to the flame.

The color of metal ions in flame is due to which of the following?

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