(a) Why does the colour of NaCl turn yellow when it is heated in an atmosphere of sodium vapour? (b) What is curie temperature?

NaCl is heated in an atmosphere of sodium vapour. The resultant yellow colour is due to the formation of

Why does KCl become violet in colour when it is heated in presence of potassium vapour?

Schottky and Frenkel defects are stoichiometric defects. When pure NaCl (Sodium Chloride) crystal is heated in an atmosphere of sodium vapours, it tums yellow. Give reason.

ZnO turns yellow on heating. Why?

Schottky and frenkel defects are stoichiometric defects. When pure NaCl(sodium chloride) crystal is heated in an atmosphere of sodium vapours, it turns yellow. Give reason.

ZnO turns yellow on heating . Why ?

Why does KCl turn violet on heating in the potassium vapours ?

Why does KCl turn violet on heating in the potassium vapours ?