Discuss each of the following observations:
(a) Although Co2~(aq) forms the tetrahedral complex [CoCl4]2- on treatment with concentrated HCl Ni21 (aq) does not form a similar complex.
(b) for the half-reaction: [Fe(CN)6]3-+e--[Fc(CN)0]4-
depends on the pH of the solution, being most positive in strongly acidic medium.
E° for the Mir+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ or Fe3+/Fe2+
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