Indicate which of the substance/ion in the following reactions is an oxidising agent and which is a reducing agent?
(i) `2FeCl+SnCl_(2)to 2FeCl_(2)+SnCl_(4)`
(ii) `2Mg+SO_(2)to2MgO+S`
(iii) `2SO_(2)+O_(2)to2SO_(3)`
(iv)`Ca+Cl_(2)toCaCl_(2)`
(v) `Sn^(2+)+2Hg^(2+) to Hg_(2)^(2+)+Sn^(4+)`
(vi) `2Cu^(2+)+4I^(-) to 2CuI+I_(2)`
(vii)`2I^(-)+H_(2)O_(2) to 2OH^(-)+I_(2)`
(viii) `SO_(2)+2H_(2)S to 3S+2H_(2)O`
(ix) `SO_(2)+2HNO_(3)to H_(2)SO_(4)+2NO_(2)`
(x) `SO_(2)+Cl_(2)+2H_(2)O to 2HCl+H_(2)SO_(4)`