Which formula equation shows a reversible reaction?
2na + f2 → 2naf
cacoạcao + co2
nh, cl(s) 2nh3 (9) + hcl (9)
2h2o2 (aq) pe> 2h20 (1) + o2(g)

The question is incomplete, here is the complete question:

Which formula equation shows a reversible reaction?

A:

B:

C:

D:

The reversible reaction is

Explanation:

Reversible reaction is defined as the reaction in which the products formed react together to give the reactants back. For general reversible chemical equation:

Irreversible reaction is defined as the reaction in which the reactants only lead to products and the reaction do not proceed back. For general irreversible chemical reaction:

For the given options:

The reaction having an equilibrium sign between the reactants and products is equation C.

Hence, the reversible reaction is

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