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| 1. |
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change. |
| Answer» Solution :The adsorption of hydrogen on finely DIVIDED nickel is due to weak VAN der Waals. forces. Thus, it is an example of physisorption. However, when the temperature is RAISED, the H, molecules breaks into H-atoms which are held by chemical adsorption on the SURFACE of the nickel. | |