Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)

Answer: Option D

The equilibrium constant $$\left(K_P\right)$$   for the reaction below can be written as : $$K_P={\left(atm\right)}^{\Delta x}$$
Where $$\Delta x=$$   change in number of moles (difference in number of moles of products $$-$$ reactants).