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Q 2630380212.     (a) Account for the following:
(i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.
(ii) `Cr^(+2) ` is a strong reducing agent.
(iii) `Cu^(+2)` salts are coloured, while `Zn^(+2)` salts are white.
(b) Complete the following equations:
(i) `2MnO_2 + 4KOH + O_2 overset Delta (->)`
(ii) `Cr_2 O_7^(2-) + 14H^(+) 6I^(-) ->`
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)