The correct option is D Concentration of all gases increases
As per Le - Chatelier principle, If pressure is increased equilibrium will shift in that direction where number of moles are less.
So, as per reaction,SO2Cl2(g)⇌SO2(g)+Cl2(g)
the equilibrium will shift towards the backward reaction
Concentration of all gases increases and equilibrium shifts toward less no. of moles but new equilibrium concentration of every gas would be higher than earlier.
Theory:
Effect of change in Volume :
According to Boyle's law at constant temperature.
P∝1V
For a reaction, when the volume V increases the concentration (ngV) of the reactants and the products decrease.
Consider A(g)⇌B(g) When, Δng=0, we know that even if pressure changes there is no shift in the equilibrium.
Therefore even if volume changes there is no shift in equilibrium.
For a reaction Δng>0
A(g)⇌2B(g) when Δng=+ve
when volume increases then ngV decreases, then the reaction goes where ngV increases . Reaction goes forward.
For a reaction when Δng<0 2A(g)⇌B(g) when Δng=−ve
Volume V increases then ngV decreases, then the reaction goes where ngV increases . Reaction goes backward.