Select the types of redox reaction form the following on the basis of type of tedox changes:
(a) intermolecular redox, (b) intramolecular redox
(c) auto redox. If none, write none.
(i) `C_(6)H_(5) CHO overset(NaOH)(rarr) C_(6)H_(5)CH_(2) OH + C_(6) H_(5) COONa`
(iI) `Cr_(2)O_(7)^(2-) + 2OH^(-) rarr 2CrO_(4)^(2-) + H_(2)O`
(iii) `2Mn_(2)O_(7) rarr 4MnO_(2) + 3O_(2)`
(iv) `NO_(3)^(-) + H_(2)S + H_(2)O + H^(+) rarr NH_(4)^(+) + HSO_(4)^(+-)`
(v) `Fe + N_(2) H_(4) rarr NH_(3) + Fe(OH)_(2)`
(vi) `2KOH + Br_92) rarr KBr + KBrO`
(vii) `2Cu^(+) rarr Cu + Cu^(2+)`
(viii) `Ag(NH_(3))_(2)^(+) overset(2H^(+))(rarr) Ag^(+) + 2NH_(4)^(+)`
(ix) `5KI + KIO_(3) + 6HCl rarr 3I_(2) + 6KCI + 3H_(2)O`

Answer

(a) `(iv),(v),(ix)`, (b) `(iii)`, (c) `(i),(vi),(vii)`