2CO(g) + O2(g) = 2CO2(g)
a. The amount of O2 is increased.
forward, reverse, or no change.

The system will shift to the right (Forward).

Explanation:

Based on the equilibrium:

2CO(g) + O2(g) ⇄ 2CO2(g)

If the amount of O2 is increased: The equilibrium will shift to the right trying to decrease this concentration following the Le-Ch principle that says:

A change in an equilibrium will be counteracted by the system producing a response that restore the initial state.

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

the answer is c i believe