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Calculate the standard cell potentials of galvanic cells in which the following reactions take place:
(i) 2Cr(s) + 3Cd2+(aq) → 2Cr3+(aq) + 3Cd
(ii) Fe2+(aq) + Ag+(aq) → Fe3+(aq) + Ag(s)
Calculate the ΔrGθ and equilibrium constant of the reactions.
Consult the table of standard electrode potentials and suggest three substances that can oxidise ferrous ions under suitable conditions