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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. | |