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Q 2671112926.     (a) Complete the following equations :
(i) `Cr_2 O_7^(2-) +2OH^(-) -> `
(ii) `MnO_4^(-) + 4H^(+) + 3e^(-) ->`
(b) Account for the following:
(i) Zn is not considered as a transition element.
(ii) Transition metals form a large number of complexes.
(iii) The `E^0` value for the `Mn^(3+)//Mn^(2+)` couple is much more positive than that for `Cr^(3+)//cr^(2+)` couple.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)