InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
ZnO is colourless at room temperature , while yellow when hot. Why ? |
| Answer» SOLUTION :ZnO is colourless at ROOM temperature . When it is heated , it becomes YELLOW in colour . On HEATING , it loses oxygen and thereby forming free `Zn^(2+)` ions . The excess `Zn^(2+)` ions move to interstitial sites and the electrons ALSO occupy the interstitial positions . | |