No. You putting iodine solution is not for cleaning the onion but actually testing for starch. Onion is a plant that makes food. Thus, onion contains starch. If you put iodine solution onto starch-present organism. the brown solution will change to darkblue solution or blueblack solutiom due to the presence of starch. If there is no starch present, the solution will remain brown. Hence, the iodine solution is npt for cleaning but for testing for the presence of starch.
D) if stuff is changing then the reaction is hardly in equilibrium is it? Everything is just chilling at equilibrium so there would be constant concentration
I believe the correct answer is C. The amount of catalyst is the same at the end as at the beginning of the reaction. Catalysts can't be consumed by the reaction thus is not D.
