Q.

Which of the following is used to remove rust stains on cloth?

A. Kerosene
B. Lime
C. Oxalic acid solution
D. Petrol
Answer» C. Oxalic acid solution
Explanation: Oxalic acid is an organic compound with the formula H2C2O2. It is a colourless crystalline solid that dissolves inwater to give colourless solutions. It is classified as a dicarboxylic acid. In terms of acid strength. it is much stronger than acetic acid. Oxalic acid is a reducing agent and its conjugate base, known as oxalate , is a chelating agent for metal cations.
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