Fill in the blanks
1. Adsorption occurs at fixed sites called ………
2. Gases like NH3 , SO3 and CO2 are …………… as have greater Van der Waals force of attraction.
3. gases like H2 , N2 , O2 have low critical temperature and ….. slowly.
4. A plot between the amount of adsorbate adsorbed and pressure or concentration of adsorbate at constant temperature is called ……
5. Freundlich adsorption isothermal equation is applicable fo adsorption of ……
6. During World War I ….. gas mask was employed
7. ….. is used to create high vaccum in vessels.
8. In blast furnace .….. is used for drying air
9. For dehydration and also purification of gases like CO2 , N2 , CI2 , O2 and He …….. and are employed.
10. …… is employed in the softening of hard water to adsorb Ca2+ and Mg2+ ions
1. active centres
2. easily liquefiable
3. Permanent, adsorbed
4. Adsorption isotherm
5. gases on solid surface
6. charcoal
7. Activated charcoal
8. silica gel
9. alumina, silica
10. Permutit