Which one of the following is an oxide?

The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal :

Fe₂O₃(s) + 3 CO(g) $$\rightleftharpoons$$ 2 Fe(1) + 3 CO₂(g)

Using the Le Chatelier’s principle, predict which one of the following will not disturb the equilibrium ?

The electronic configuration with the highest ionization enthalpy is :

The rate of a reaction quadruples when the temperature changes from 300 to 310 K. The activation energy of this reaction is :

(Assume activation energy and preexponential factor are independent of temperature; ln 2 = 0.693; R = 8.314 J mol⁻¹ K⁻¹)