If the volume of the system is decreased, no shift will occur
Further explanation
In the equilibrium system, according to Le Chatelier, if there is a reaction there will be action
Reaction = - action
The reaction taken by the system is to shift the reaction to the right or left.
The composition of chemical reactions in equilibrium can be influenced by temperature, pressure, and concentration.
While on the change in pressure(volume), then the addition of pressure, the reaction will shift towards a smaller reaction coefficient ((the fewest moles of gas )
This pressure usually affects the gas equilibrium system(only count the number of moles of gases)
Reaction
NO₂ (g)+CO (g)↔NO(g)+CO₂(g)
The reactant side of the equation has 2 moles of a gas(1 mole NO₂ and 1 mole CO) ; the product side has 2 moles (1 mole NO and 1 mole CO₂)
So the total number of moles from both sides is the same(2 moles) so that the change in volume (pressure) does not change the direction of equilibrium⇒No shift will occur