Stains of rust on clothes can be removed by :
A). Oxalic acid
B). Petrol
C). Alcohol
D). H2O2
Oxalic acid
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.
2. The National Chemical Laboratory is situated in
3. Alum stops bleeding in minor cuts because of
5. Which one of the following is used to restore the colour of old oil paintings?
6. Water is not effective in extinguishing a fire caused by petrol because
7. Of the following which one pollutes the air of abig city?
8. _______ is the major component of natural gas.
9. Which of the following is not a natural source of hydrocarbon?