Adsorption and Colloids — Chemistry STD 11 Science — Question
Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryAdsorption and Colloids4 Marks
Question
Write a short note on catalytic activity.
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Answer
The catalytic activity of a catalyst depends on the strength of chemisorption.
If large number of reactant molecules $($gas or liquid$)$ are strongly adsorbed on the surface of solid catalyst, the catalyst is said to be active.
However, the adsorption of reactant molecules on the surface, that is, the bond formed between adsorbate and adsorbent surface should not be very strong so that they are not immobilized.
$d-$block metals such as $Fe, V$ and $Cr$ tend to be strongly active towards $O_2, C_2H_2, C_2H_4, CO, H_2, CO_2, N_2,$ etc.
$Mn$ and $Cu$ are unable to adsorb $N_2$ and $CO_2.$
The metals $Mg$ and $Li$ adsorb $O_2$ selectively.
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