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| Q. |
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» A. Oxalic acid | |
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Explanation: Oxalic acid is a reducing agent and its conjugate base, known as oxalate is a chelating agent for metal cations. Oxalic acid's main applications include cleaning or bleaching, especially for the removal of rust, e.g. Bar Keepers Friend is an example of a household cleaner containing oxalic acid. Its utility in rust removal agents is due to its forming a stable, water soluble salt with ferric iron, ferrioxalate ion. |
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