An allergy pill has the following information on its label: this product will reduce the effects of hay fever. this product has not been evaluated by the food and drug administration: this product contains all-natural ingredients. which claim is made by this product? a this product can treat hay fever. b this product is made by chemicals. c this product was designed by scientists. d this product is only available by prescription.

  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-