20. Which one of the following organic compound is used to remove stains of iron compounds? A.Oxalic acid B.Benzoic acid C.Phthalic acid D.Cinnamic acid
Answer: Option A Solution: Oxalic acid is widely used as an acid rinse in laundries, where it is effective in removing rust and ink stains because it converts most insoluble iron compounds into a soluble complex ion.
