Answer the following question:

Differentiate between reversible and irreversible reactions.
Answer variants:
It does not attain equilibrium.
It attains equilibrium.
\(C{(s)}\) + \(O_2{(g)}\) → \(CO_2{(g)}\) + \(Heat\)
It is a slow process.
It is fast.
All reversible reactions occur only at high temperature
\(PCl_5{(g)}\) ⇄ \(PCl_3{(g)}\) + \(Cl_2{(g)}\)
Reversible reaction:
 
i.
ii.  
iii. Example:
 
Irreversible reaction:
 
i.
ii.
iii. Example: