which formula equation shows a reversible reaction?\no (2na + f_{2}\rightarrow2naf)\no (caco_{3}\rightarrow…

which formula equation shows a reversible reaction?\no (2na + f_{2}\rightarrow2naf)\no (caco_{3}\rightarrow cao + co_{2})\no (nh_{4}cl(s)leftrightarrow nh_{3}(g)+hcl(g))\no (2h_{2}o_{2}(aq)xrightarrow{pt}2h_{2}o(l)+o_{2}(g))

which formula equation shows a reversible reaction?\no (2na + f_{2}\rightarrow2naf)\no (caco_{3}\rightarrow cao + co_{2})\no (nh_{4}cl(s)leftrightarrow nh_{3}(g)+hcl(g))\no (2h_{2}o_{2}(aq)xrightarrow{pt}2h_{2}o(l)+o_{2}(g))

Answer

Brief Explanations:

In a reversible reaction, the reaction can proceed in both the forward and reverse directions. This is indicated by a double - headed arrow ($\leftrightarrow$). The first two reactions have single - headed arrows ($\to$) which represent irreversible reactions. The fourth reaction has an arrow with a catalyst symbol above it, also representing an irreversible reaction. The third reaction $NH_{4}Cl(s)\leftrightarrow NH_{3}(g)+HCl(g)$ has a double - headed arrow, showing it is a reversible reaction.

Answer:

$NH_{4}Cl(s)\leftrightarrow NH_{3}(g)+HCl(g)$