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| Q. |
Which of the following is used to remove ink and rust stains on cloth? |
| A. | Oxalic acid |
| B. | Alcohol |
| C. | Ether |
| D. | Kerosene oil |
| 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 and stain removal. Oxalic acid's main applications include cleaning or bleaching, removal of stains on clothes and the removal of rust. |
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