Which of the following is a balanced chemical equation? a, h2o2 → h2o + o2 b, 2 mg + hc1 → mgcl2 + h2 c, so2 + o2 + 2 h2o → 4 h2so4 d , 2 fe2o3 + 3 c → 4 fe + 3 co2

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-