Identify the substances that are oxidised and the substances that are reduced in the following reactions.
(i) `4Na(s) + O_2(g) to 2Na_2O(s)`
(ii) `CuO(s) + H_2(g) to Cu(s) + H_2O(l)`

Identify the oxidising agent, reducing agent, substance oxidised and substance reduced in the following reactions. MnO_2 + 4HCl to MnCl_2 + Cl_2 + 2H_2O

Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions : a) 2AgBr(s)+C_(6)H_(6)O_(2)(aq)to2Ag(s)+2HBr(aq)+C_(6)H_(4)O_(2)(aq) b) HCHO(l)+2[Ag(NH_(3))_(2))^(+)(aq)+3OH^(-)(aq)to2Ag(s)+HCOO^(-)(aq)+4NH_(3)(aq)+2H_(2)O(l) c) HCHO(l)+2Cu^(2+)(aq)+5OH^(-)(aq)toCu_(2)O(s)+HCOO^(-)(aq)+3H_(2)O(l) d) N_(2)H_(4)(l)+2H_(2)O_(2)(l)toN_(2)(g)+4H_(2)O(l) e) Pb(s)+PbO_(2)(s)+2H_(2)SO_(4)(aq)to2PbSO_(4)(s)+2H_(2)O(l)

Balance the following chemical equations. iv) Cu_((s))+O_(2(g))rarr CuO_((s))

Complete and balance the following reactions : (i) H_(2)(g) + M_(6)O_(3)(s) overset(Delta)(rarr) .

In the reaction, H_(2)S+H_(2)O_(2) to S+2H_(2)O: