109
Question
The appearance of colour in solid alkali metal halides is generally due to
The appearance of colour in solid alkali metal halides is generally due to
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Solution
The correct option is B F-centres
F-centeres are the sites where anions are missing and instead electrons are present. They are responsible for colours. The colour results due to the excitation of electrons when they absorbs energy from the vissible light falling on the crytal surface.
F-centeres are the sites where anions are missing and instead electrons are present. They are responsible for colours. The colour results due to the excitation of electrons when they absorbs energy from the vissible light falling on the crytal surface.
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