Assertion: `ZnO` becomes yellow when it is heated.
Reason: The anionic sites occupied by unpared electrons (due to F_centres)

Assertion: ZnO becomes yellow when it is heated. Reason: The anionic sites occupied by unpaired electrons (due to F-centres )

The anionic sites occupied by electrons are called

The anionic sites occupied by electrons are called

Assertion : ZnO becomes yellow when it is beated Reason: NaCI becomes yellow when heater in the presence of Na vapours due to anion vacancy

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 ?

Give reason: Zinc oxide becomes yellow on heating

Assertion: Mass of a body decreases slightly when it is negatively charged. Reason: Charging is due to transfer of electrons.

Why does white ZnO(s) becomes yellow upon heating ?