1.(i) Aluminium and iron items are in contact with dilute HCl. Aluminium will corrode faster because after reaction with dilute HCl aluminium forms aluminium chloride and iron forms iron chloride. Aluminium chloride is more affinity towards water than iron chloride and also aluminium chloride can react at room temperature but iron chloride requires a high temperature.
(ii) Chemical reaction of Aluminium corrosion :
Aluminium + oxygen = Aluminium oxide
4Al + 3O2 = 2Al2O3
Chemical reaction of iron corrosion :
4Fe + 3O2 ---> 2Fe2O3
(iii) A chemical substance is reducing that loses an electron to another chemical species in a redox chemical reaction. Example - Calcium
(iv) ∆G of the reaction for aluminium corrosion:
∆G= -nFE
Where n = no of electrons which take part in the reaction that is 5 electrons
F = Faraday's constant=96485 C.mol^-1
E = -1.70 - ( -0.44) = -1.26
So ∆G = -5*96485*(-1.26) = 607855.5