The following balanced equations represent reactions that occur in aqueous base. Break them down into balanced oxidation and reduction half-equations.

  

     

(a) 4 PH;(g) + 4 H,0() + 4 CrO (aq) P4(s) + 4 Cr(OH),(aq) + 4 OH (aq) (b) Nio,(s) + 2 H,0() + Fe(s) Ni(OH),(s) + Fe(OH),(s) (c) 2 OH (aq) + 2 NO,(g) NO (aq) + NO, (aq) + H,O(f)