Gastric juices have a pH of 1 or 2. This would indicate which of the following?
numerous OH- ions and a high pH
numerous OH- ions and a low pH
neutral fluids, perfect for decomposition reactions
numerous H+ ions and a low pH

numerous H+ ions and a low pH.

Explanation:

pH is defined as the negative logarithm of the reciprocal of the hydrogen ion activity, H+ in a solution. It is also a measure of the acidity and basicity of a solution.

Acids dissociate in aqueous solution to give H+.

  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-