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| Q. |
Stains of rust on clothes can be removed by – |
| A. | Oxalic acid |
| B. | Petrol |
| C. | Alcohol |
| D. | H2O2 |
| Answer» A. Oxalic acid | |
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Explanation: 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. |
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