Which is the correct set of products for the acid - base neutralization reaction between hydrochloric acid (hcl) and calcium hydroxide ca (oh)2?
a -
cah and hcl
b -
cacl, and h2o
c -
cacl2 and h2o
d -
cacl2 and h3o2

The correct equation is

Ca(OH)2 +  2HCl >    CaCl2 +  2H2O

You are not required to deal with balance numbers so the correct answer is C.

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  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-