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F-Centres are:...

F-Centres are:

A

the electrons trapped in anionic vacancies

B

the electrons trapped in cation vacancies

C

non-equivalent sites of stoichometric compound

D

all of the above

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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 ?

The presence of F-centres in a crystal makes it

F - centres in an ionic crystals are

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  14. Assertion : In point defect density of solid maydecrease and increase ...

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  16. Statement -1 An ionic structure is composed of oppositely charged ions...

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