Double replacement reactions typically involve the exchange of ions between two reactants, often resulting in the formation of a precipitate, water, or gas.

Here's why not all gases are commonly produced:

* Commonly produced gases:

* Carbon dioxide (CO₂): This is formed when a carbonate (CO₃²⁻) reacts with an acid.

* Hydrogen sulfide (H₂S): This is formed when a sulfide (S²⁻) reacts with an acid.

* Ammonia (NH₃): This is formed when an ammonium salt (NH₄⁺) reacts with a strong base.

* Less commonly produced gases:

* Other gases like oxygen (O₂), nitrogen (N₂), or noble gases are not typically produced in double replacement reactions. These gases are more likely to be produced in other types of reactions like decomposition or combustion.

In summary: While some gases are commonly produced in double replacement reactions, others are not. The specific gas produced depends on the reactants involved.