Which formula equation shows a reversible reaction? a. 2na+f2–> 2naf b. caco3–> cao+co2 c. nh4ci(s)—–nh3( g.+hci( g. 2h2o2(aq)–pt—> 2h2o(i)+o2( g.?

The formula equation that  shows   a  reversible  reaction  is

NH4Cl (s) ⇔ NH3 (g)  + HCl (g) ( answer  C)

           

            Explanation

Reversible  reaction  is  a chemical reaction    where the reactants form products , where in turn react together to form reactant   back. The  reaction of  NH4Cl (s)⇔ NH3(g)  + HCl (g)  is a reversible reaction  since   NH4Cl  decompose to form NH3  and HCl which in  turn react together to form NH4Cl back .

A) the enthralling of formation for pure element in its standard state is always positivehope this : )