Question

Explain catalytic property of 3d series elements.

Answer 1

i. Transition metals possess variable oxidation states. Hence, they can absorb and re-emit a wide range of energies. Thus, they can provide necessary activation energy.

ii. Mechanism of 2I^- + S₂O₈^2- \(\overset{fe^{3+}}\longrightarrow\) I₂  +  2SO₄^2- is as shown below.

a. 2Fe³⁺ + 2I^- → 2Fe²⁺ + I₂

b. 2Fe²⁺ + S₂O₈^2- → 2Fe³⁺ + 2SO₄^2-

iii. Transition metals possess free valencies on the surface. Hence, they can adsorb the reacting molecules. Thus, the concentration of the reactants increases on the surface. This increases the rate of reaction.