Statement `:` Solids containing `F-` centres are paramagnetic. Explanation `: F-` centres solids possess holes occupied by unpaired electrons.
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Assertion (A) : Solids containing F centres are paramagnetic. Reason (R ) : Solids containing F centres conduct electricity and it is n -type semiconduction.
Consider the following statements I. NaCl and KCl show metal excess defect due to anionic vacancies II. F- centres are the anionic site occupied by unpaired electrons III. F-centres is derived from the germen word farbenzenter for colour centre . F-centres impart yellow colour to the NaCl crystals Which of the above statements is / are correct ?
Assertion : Superoxides of alkali metals are paramagnetic. Reason : Superoxides contain the ion O_(2)^(-) which has one unpaired electron.
What are F-centres in ionic crystals ? Why are crystals having F-centres are paramagnetic in nature.
