41. Stains of rust on clothes can be removed by : A.Oxalic acid B.Petrol C.Alcohol D.H2O2
Answer: Option A Solution: Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water.
