Question
Given below are two statements for catalytic properties of transition metals :
Statement I : First row transition metals which act as catalyst utilise their 3d electrons only for formation of bonds between reactant molecules and atoms on the surface of catalyst.
Statement II : There is increase in the concentration of reactants on the surface of catalyst which strengthens the bonds in reacting molecules.
In the light of the above statements, choose the correct answer from the option given below :
Options
Solution
Sol. [Key Concept: Both statements are incorrect: first-row transition metals use both $3d$ and $4s$ electrons in surface bonding, and adsorption weakens (not strengthens) the reactant bonds, thereby lowering the activation energy.]
First row transition metals utilize 3d and 4s electrons for bonding on the catalyst surface.
∴ Statement 1 is incorrect
Adsorption increases reactant concentration on the catalyst surface and weakens bonds facilitating formation of activated complex and lowering activation energy.
∴ Statement 2 is incorrect
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