equilibrium question

smaller volume means increased pressure - since the moles of reactants and products are equal on each side then any change in pressure should not effect equilibrium so i picked the answer as a) which is no visible change... why is the answer D!!! (the mixture goes purple ) so equilbrium shifts to thr right?? why

if i think of it in another way less volume will increase the tempreture so this will shift equlibrium to the left and its B so still not D ugh :frown:

can somone pls explain ..thanks x

Original post by pondsteps

smaller volume means increased pressure - since the moles of reactants and products are equal on each side then any change in pressure should not effect equilibrium so i picked the answer as a) which is no visible change... why is the answer D!!! (the mixture goes purple ) so equilbrium shifts to thr right?? why

if i think of it in another way less volume will increase the tempreture so this will shift equlibrium to the left and its B so still not D ugh :frown:

can somone pls explain ..thanks x

You're overthinking this one. Put the same number of moles of a coloured gas in a smaller volume and it will look darker.