The appearance of colour in solid alkali meta | vedclass

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(D) The appearance of colour in solid alkali metal halides is generally due to $F$-centres (Farbe centres).These are anionic vacancies occupied by unp

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$F$-centres

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(D) The appearance of colour in solid alkali metal halides is generally due to $F$-centres (Farbe centres).These are anionic vacancies occupied by unpaired electrons.When white light falls on these crystals,the electrons absorb energy from the visible region to get excited,which results in the crystal exhibiting a complementary colour.For example,$NaCl$ with $F$-centres appears yellow,$KCl$ appears magenta,and $KBr$ appears blue.

The appearance of colour in solid alkali metal halides is generally due to

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