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 choice c. NH₄CI(s) ⇄ NH₃(g) + HCI(g) is the reversible reaction.

Explanation:

The formula equations given are:

a. 2Na + F₂ → 2NaF b. CaCO₃ → CaO + CO₂ c. NH₄CI(s) ⇄ NH₃(g) + HCI(g)

                             

d. 2H₂O₂(aq)  →  2H₂O(I)+O₂(g)

        [there is also a Pt symbol over the arrow, which means that Pt

          is a catalyst]

Reversible reactions are reactions that may happen in both directions, i.e. there is a direct or forward reaction and a reverse reaction.

The symbol used to show a reversible reaction is the double arrow (⇄).

The double arrow shows tha both left side substances and right side substances are reactants and products.

In the reaction NH₄CI(s) ⇄ NH₃(g) + HCI(g) you have:

NH₄CI(s) → NH₃(g) + HCI(g) is the direct reaction. In this, NH₄CI(s) is the reactant and NH₃(g) + HCI(g) are the products.NH₄CI(s) ← NH₃(g) + HCI(g) (notice the arrow goes from right to left)  is the reverse reaction. In this, NH₄CI(s) is the product and both NH₃(g) and HCI(g) are the reactants.

All the other equations are written with a single arrow, so they are not reversible reactions.

It has to be b i hope this

Ibelieve the answer is d