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| 1. |
What are active centres? |
| Answer» Solution : (i) The surface of a catalyst is not SMOOTH. It bears steps, cracks and corners. (ii) Hence the atoms on such locations of the surface are co-ordinatively unsaturated. iii) So, they have much residual force of attraction. (iv) Such sites are CALLED active centres. So, the surface carries HIGH surface free ENERGY (v) The presence of such active centres increases the rate of REACTION by adsorbing and activating the reactants | |