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(a) Complete the following chemical equ...

(a) Complete the following chemical equations:
(i) ` Cr_(2) O_(7)^(2-) (aq) + H_(2) S(g) + H^(+) (aq) to `
(ii) ` Cu^(2+)(aq) + I^(-) (aq) to `
(b) How would you account for the following :
(i) The oxidising power of oxoanions are in the order `VO_(2)^(+) lt Cr_(2)O_(7)^(2-) lt Mn O_(4)^(-) `
(ii) The third ionization enthalpy of manganess (Z = 25) is exceptionally high.
(iii) `Cr^(2+)` is a stronger reducing agent than `Fe^(2+)`.

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