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
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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